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SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4)* LAMAR ADVERTISING COMPANY (Name of Issuer) CLASS A COMMON STOCK, PAR VALUE $0.001 PER SHARE (Title of Class of Securities) 512815101 (CUSIP Number) SPO Advisory Corp. 591 Redwood Highway, Suite 3215 Mill Valley, California 94941 (415) 383-6600 with a copy to: Alison S. Ressler Sullivan & Cromwell LLP 1888 Century Park East Los Angeles, California 90067-1725 (310) 712-6600 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) September 27, 2007 (Date of Event which Requires Filing of This Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box |_|. Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Partners II, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,495,969 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 9,495,969 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,495,969 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SPO Advisory Partners, L.P.

CUSIP No. 512815101 Page 2 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Advisory Partners, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,495,969 (1)(2) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 9,495,969 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,495,969 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of SPO Partners II, L.P. (2) Power is exercised through its sole general partner, SPO Advisory Corp.

CUSIP No. 512815101 Page 3 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON San Francisco Partners II, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 469,630 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 469,630 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 469,630 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SF Advisory Partners, L.P.

CUSIP No. 512815101 Page 4 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SF Advisory Partners, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 469,630 (1)(2) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 469,630 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 469,630 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of San Francisco Partners II, L.P. (2) Power is exercised through its sole general partner, SPO Advisory Corp.

CUSIP No. 512815101 Page 5 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Advisory Corp. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,965,599 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 9,965,599 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,965,599 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 12.2% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of SPO Advisory Partners, L.P. with respect to 9,495,969 of such shares; and solely in its capacity as the sole general partner of SF Advisory Partners, L.P. with respect to 469,630 of such shares. (2) Power is exercised through its three controlling persons, John H. Scully, William E. Oberndorf and William J. Patterson.

CUSIP No. 512815101 Page 6 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON John Scully - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 225,600 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 9,965,599 (2) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 225,600 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,965,599 (2) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,191,199 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 12.4% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) Of these shares, 3,100 shares are held in the John H. Scully Individual Retirement Accounts, which are self-directed, and 222,500 shares may be deemed to be beneficially owned by Mr. Scully solely in his capacity as controlling person, sole director and executive officer of Phoebe Snow Foundation, Inc. (2) These shares may be deemed to be beneficially owned by Mr. Scully solely in his capacity as one of three controlling persons of SPO Advisory Corp.

CUSIP No. 512815101 Page 7 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William E. Oberndorf - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 9,965,599 (1) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,965,599 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,965,599 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 12.2% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) These shares may be deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as one of three controlling persons of SPO Advisory Corp.

CUSIP No. 512815101 Page 8 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William J. Patterson - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 300 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 9,975,299 (2) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 300 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,975,299 (2) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,975,599 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 12.2% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) These shares are held in the William J. Patterson Individual Retirement Account, which is self directed. (2) Of these shares, 9,965,599 shares may be deemed to be beneficially owned by Mr. Patterson solely in his capacity as one of three controlling persons of SPO Advisory Corp. and 9,700 shares may be deemed to be beneficially owned by Mr. Patterson solely in his capacity as a controlling person, director and executive officer of The Elizabeth R. & William J. Patterson Foundation.

CUSIP No. 512815101 Page 9 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Phoebe Snow Foundation, Inc. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 222,500 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 222,500 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 222,500 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.3% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO - -------------------------------------------------------------------------------- (1) Power is exercised through its controlling person, sole director and executive officer, John H. Scully.

CUSIP No. 512815101 Page 10 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON The Elizabeth R. & William J. Patterson Foundation - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,700 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 9,700 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,700 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO - -------------------------------------------------------------------------------- ** Denotes less than. (1) Power is exercised through its controlling persons, directors and executive officers, William J. Patterson and Elizabeth R. Patterson.

CUSIP No. 512815101 Page 11 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Eli J. Weinberg - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS PF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 120 ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 120 ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 120 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- ** Denotes less than.

CUSIP No. 512815101 Page 12 of 44 pages - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Ian R. McGuire - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS PF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 1,156 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 1,156 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,156 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- ** Denotes less than. (1) Of these shares, 256 shares are held in the Ian R. McGuire Individual Retirement Account, which is self-directed.

Page 13 of 44 pages This Amendment No. 4 amends the Schedule 13D (the "Original 13D") filed with the Securities and Exchange Commission ("SEC") on August 22, 2005 and as amended on May 10, 2006, July 19, 2006 and July 31, 2007. Unless otherwise stated herein, the Original 13D, as previously amended, remains in full force and effect. Terms used therein and not defined herein shall have the meanings ascribed thereto in the Original 13D. ITEM 2. IDENTITY AND BACKGROUND. Item 2(a) is hereby amended and restated in its entirety as follows: (a) The undersigned hereby file this Schedule 13D Statement on behalf of SPO Partners II, L.P., a Delaware limited partnership ("SPO"), SPO Advisory Partners, L.P., a Delaware limited partnership ("SPO Advisory Partners"), San Francisco Partners II, L.P., a California limited partnership ("SFP"), SF Advisory Partners, L.P., a Delaware limited partnership ("SF Advisory Partners"), SPO Advisory Corp., a Delaware corporation ("SPO Advisory Corp."), John H. Scully ("JHS"), William E. Oberndorf ("WEO"), William J. Patterson ("WJP"), Phoebe Snow Foundation, Inc., a California corporation ("PS Foundation"), The Elizabeth R. & William J. Patterson Foundation, a California corporation ("Patterson Foundation"), Eli J. Weinberg ("EJW") and Ian R. McGuire ("IRM"). SPO, SPO Advisory Partners, SFP, SF Advisory Partners, SPO Advisory Corp., JHS, WEO, WJP, PS Foundation, Patterson Foundation, EJW and IRM are sometimes hereinafter referred to as the "Reporting Persons." The Reporting Persons are making this single, joint filing because they may be deemed to constitute a "group" within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the "Act"), although neither the fact of this filing nor anything contained herein shall be deemed to be an admission by the Reporting Persons that a group exists. The following subsection is hereby added to Item 2(b)-(c) in appropriate alphabetical order as follows: IRM IRM's business address is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. His present principal occupation is as a principal for SPO Partners & Co.

Page 14 of 44 pages ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. Item 3 is hereby amended and restated in its entirety as follows: The source and amount of the funds used or to be used by the Reporting Persons to purchase Shares are as follows: NAME SOURCE OF FUNDS AMOUNT OF FUNDS - --------------------- --------------------------- --------------- SPO Contributions from Partners $436,006,838 SPO Advisory Partners Not Applicable Not Applicable SFP Contributions from Partners $20,460,359 SF Advisory Partners Not Applicable Not Applicable SPO Advisory Corp. Not Applicable Not Applicable JHS Not Applicable and Personal Funds $176,634 WEO Not Applicable Not Applicable WJP Not Applicable and Personal Funds $16,483 PS Foundation Contributions from Shareholders $12,685,349 Patterson Foundation Contributions from Shareholders $554,058 EJW Personal Funds $5,282 IRM Personal Funds $61,176 ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. (a) Percentage interest calculations for each Reporting Person are based upon the Issuer having 81,872,372 total outstanding shares of Class A common stock as reported on the Issuer's 10-Q filed with the Securities and Exchange Commission on August 8, 2007. SPO The aggregate number of Shares that SPO owns beneficially, pursuant to Rule 13d-3 of the Act, is 9,495,969 Shares, which constitutes approximately 11.6% of the outstanding Shares. SPO Advisory Partners Because of its position as the sole general partner of SPO, SPO Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,495,969 Shares, which constitutes approximately 11.6% of the outstanding Shares. SFP The aggregate number of Shares that SFP owns beneficially, pursuant to Rule 13d-3 of the Act, is 469,630 Shares, which constitutes approximately 0.6% of the outstanding Shares.

Page 15 of 44 pages SF Advisory Partners Because of its position as the sole general partner of SFP, SF Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 469,630 Shares, which constitutes approximately 0.6% of the outstanding Shares. SPO Advisory Corp. Because of its positions as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,965,599 Shares in the aggregate, which constitutes approximately 12.2% of the outstanding Shares. JHS Individually, and because of his positions as a control person of SPO Advisory Corp. and controlling person, sole director and executive officer of PS Foundation, JHS may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 10,191,199 Shares, which constitutes approximately 12.4% of the outstanding Shares. WEO Because of his position as a control person of SPO Advisory Corp., WEO may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,965,599 Shares, which constitutes approximately 12.2% of the outstanding Shares. WJP Individually and because of his position as a control person of SPO Advisory Corp. and as a control person, director and executive officer of Patterson Foundation, WJP may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,975,599 Shares, which constitutes approximately 12.2% of the outstanding Shares. PS FOUNDATION The aggregate number of Shares that PS Foundation owns beneficially, pursuant to Rule 13d-3 of the Act, is 222,500 Shares, which constitutes approximately 0.3% of the outstanding Shares.

Page 16 of 44 pages PATTERSON FOUNDATION The aggregate number of Shares that Patterson Foundation owns beneficially, pursuant to Rule 13d-3 of the Act, is 9,700 Shares, which constitutes less than 0.1% of the outstanding Shares. EJW The aggregate number of Shares that EJW owns beneficially, pursuant to Rule 13d-3 of the Act, is 120 Shares, which constitutes less than 0.1% of the outstanding Shares. IRM The aggregate number of Shares that IRM owns beneficially, pursuant to Rule 13d-3 of the Act, is 1,156 Shares, which constitutes less than 0.1% of the outstanding Shares. To the best of the knowledge of each of the Reporting Persons, other than as set forth above, none of the persons named in Item 2 hereof is the beneficial owner of any Shares. (b) SPO Acting through its sole general partner, SPO has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,495,969 Shares. SPO Advisory Partners Acting through its sole general partner and in its capacity as the sole general partner of SPO, SPO Advisory Partners has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,495,969 Shares. SFP Acting through its sole general partner, SFP has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 469,630 Shares. SF Advisory Partners Acting through its sole general partner and in its capacity as the sole general partner of SFP, SF Advisory Partners has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 469,630 Shares. SPO Advisory Corp. Acting through its controlling persons and in its capacities as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, SPO Advisory Corp. has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,965,599 Shares in the aggregate.

Page 17 of 44 pages JHS As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, JHS may be deemed to have shared power with WEO and WJP to vote or to direct the vote and to dispose or to direct the disposition of 9,965,599 Shares held by SPO and SFP in the aggregate. In addition, JHS has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 3,100 Shares held in the John H. Scully Individual Retirement Accounts, which are self-directed individual retirement accounts, and 222,500 Shares held by the PS Foundation, for which JHS is the controlling person, sole director and executive officer. WEO As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, WEO may be deemed to have shared power with JHS and WJP to vote or to direct the vote and to dispose or to direct the disposition of 9,965,599 Shares held by SPO and SFP in the aggregate. WJP As one of the controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, WJP may be deemed to have shared power with JHS and WEO to vote or to direct the vote and to dispose or to direct the disposition of 9,965,599 Shares held by SPO and SFP in the aggregate. WJP may be deemed to have shared power to vote or to direct the vote and to dispose or to direct the disposition of 9,700 Shares held by the Patterson Foundation. In addition, WJP has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 300 Shares held in the William J. Patterson Individual Retirement Account, which is a self-directed individual retirement account. PS FOUNDATION Acting through its controlling person, PS Foundation has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 222,500 Shares. PATTERSON FOUNDATION Acting through its two controlling persons, directors and executive officers, Patterson Foundation has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,700 Shares. EJW EJW has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 120 Shares. IRM IRM has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 256 Shares held in the Ian R. McGuire Individual Retirement Account, which is a self-directed individual retirement account. In addition, IRM has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 900 Shares. (c) Within the past 60 days of the date of this statement, Reporting Persons purchased Shares in open market transactions on the Nasdaq Global Select Market as set forth on Schedule I attached hereto.

Page 18 of 44 pages Except as set forth in this paragraph (c), to the best of the knowledge of each of the Reporting Persons, none of the persons named in response to paragraph (a) has effected any transactions in Shares during the past 60 days. (d) Each of the Reporting Persons affirms that no person other than such Reporting Person has the right to receive or the power to direct the receipt of distributions with respect to, or the proceeds from the sale of, Shares owned by such Reporting Person. (e) Not applicable. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. Item 7 is hereby amended and restated in its entirety as follows: Exhibit A: Agreement pursuant to Rule 13d-1 (k) Exhibit B: Powers of Attorney (previously filed) Exhibit C: Power of Attorney

Page 19 of 44 pages SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated October 1, 2007 By: /s/ Kim M. Silva -------------------------------- Kim M. Silva Attorney-in-Fact for: SPO PARTNERS II, L.P.(1) SPO ADVISORY PARTNERS, L.P.(1) SAN FRANCISCO PARTNERS II, L.P.(1) SF ADVISORY PARTNERS, L.P.(1) SPO ADVISORY CORP.(1) JOHN H. SCULLY(1) WILLIAM E. OBERNDORF(1) WILLIAM J. PATTERSON(1) PHOEBE SNOW FOUNDATION, INC.(1) THE ELIZABETH R. & WILLIAM J. PATTERSON FOUNDATION(1) ELI J. WEINBERG(1) IAN R. McGUIRE(2) (1) A Power of Attorney authorizing Kim M. Silva to act on behalf of this person or entity has been previously filed with the Securities and Exchange Commission. (2) A Power of Attorney authorizing Kim M. Silva to act on behalf of this person or entity is filed as Exhibit C.

Page 20 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 7/30/2007 Buy 7,800 58.5000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 7/30/2007 Buy 300 58.5000 Open Market/Broker John H Scully's IRRA 7/30/2007 Buy 100 58.5000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/8/2007 Buy 391 56.0000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/8/2007 Buy 56,309 56.0100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/8/2007 Buy 13 56.0000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/8/2007 Buy 1,887 56.0100 Open Market/Broker John H Scully's IRRA 8/8/2007 Buy 8 56.0000 Open Market/Broker John H Scully's IRRA 8/8/2007 Buy 1,192 56.0100 Open Market/Broker William H. Patterson's IRA 8/8/2007 Buy 1 56.0000 Open Market/Broker William H. Patterson's IRA 8/8/2007 Buy 199 56.0100 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 98 52.2700 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 196 52.3100 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 633 52.3300 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 195 52.3400 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 147 52.3500 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,074 52.3600 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 976 52.3900 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 2,245 52.4000 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 293 52.4900 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 195 52.5200 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 102 52.5400 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 98 52.5500 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 2,338 52.5600 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 488 52.5800 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 8,218 52.7500 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 878 52.7600 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 389 52.7700 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 2,513 52.7800 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 2,183 52.7900 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,160 52.8000 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 390 52.8050 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,327 52.8100 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 402 52.8200 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 17,017 52.8300 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,398 52.8400 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 19,083 52.8500 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 5,856 52.8550 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 9,326 52.8600 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 2,151 52.8700 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,269 52.8800 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,074 52.8900 Open Market/Broker

Page 21 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 8/21/2007 Buy 6,410 52.9000 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 1,171 52.9800 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 2,994 52.9900 Open Market/Broker SPO Partners II, L.P. 8/21/2007 Buy 3,313 53.0000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 2 52.2700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 4 52.3100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 13 52.3300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 4 52.3400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 3 52.3500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 22 52.3600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 20 52.3900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 46 52.4000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 6 52.4900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 4 52.5200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 2 52.5400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 2 52.5500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 48 52.5600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 10 52.5800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 168 52.7500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 18 52.7600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 8 52.7700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 52 52.7800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 45 52.7900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 24 52.8000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 8 52.8050 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 27 52.8100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 8 52.8200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 349 52.8300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 29 52.8400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 391 52.8500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 120 52.8550 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 191 52.8600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 44 52.8700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 26 52.8800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 22 52.8900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 131 52.9000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 24 52.9800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 61 52.9900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/21/2007 Buy 68 53.0000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.3400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.3500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.3600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.3900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 3 52.4000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.4900 Open Market/Broker

Page 22 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.5200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 2 52.5600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.5800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 8 52.7500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.7600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 3 52.7800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 2 52.7900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.8000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.8100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 17 52.8300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.8400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 20 52.8500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 6 52.8550 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 10 52.8600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 2 52.8700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.8800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.8900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 7 52.9000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 1 52.9800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 3 52.9900 Open Market/Broker

Page 23 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 8/21/2007 Buy 3 53.0000 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.3300 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.3600 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.3900 Open Market/Broker John H Scully SEP 8/21/2007 Buy 2 52.4000 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.5400 Open Market/Broker John H Scully SEP 8/21/2007 Buy 3 52.5600 Open Market/Broker John H Scully SEP 8/21/2007 Buy 9 52.7500 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.7600 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.7700 Open Market/Broker John H Scully SEP 8/21/2007 Buy 2 52.7800 Open Market/Broker John H Scully SEP 8/21/2007 Buy 3 52.7900 Open Market/Broker John H Scully SEP 8/21/2007 Buy 2 52.8000 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.8100 Open Market/Broker John H Scully SEP 8/21/2007 Buy 17 52.8300 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.8400 Open Market/Broker John H Scully SEP 8/21/2007 Buy 20 52.8500 Open Market/Broker John H Scully SEP 8/21/2007 Buy 6 52.8550 Open Market/Broker John H Scully SEP 8/21/2007 Buy 10 52.8600 Open Market/Broker John H Scully SEP 8/21/2007 Buy 2 52.8700 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.8800 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.8900 Open Market/Broker John H Scully SEP 8/21/2007 Buy 7 52.9000 Open Market/Broker John H Scully SEP 8/21/2007 Buy 1 52.9800 Open Market/Broker John H Scully SEP 8/21/2007 Buy 3 52.9900 Open Market/Broker John H Scully SEP 8/21/2007 Buy 3 53.0000 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.3300 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.3600 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.3900 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 2 52.4000 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 2 52.5600 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 9 52.7500 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.7600 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.7700 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 2 52.7800 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 2 52.7900 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.8000 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.8050 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 2 52.8100 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.8200 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 18 52.8300 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 2 52.8400 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 19 52.8500 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 6 52.8550 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 9 52.8600 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 3 52.8700 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.8800 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.8900 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 7 52.9000 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 1 52.9800 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 3 52.9900 Open Market/Broker John H Scully's IRRA 8/21/2007 Buy 3 53.0000 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.3300 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.3600 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.3900 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.4000 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.5600 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.5800 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 8 52.7500 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.7600 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 3 52.7800 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.7900 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.8000 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.8050 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.8100 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.8200 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 17 52.8300 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.8400 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 19 52.8500 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 6 52.8550 Open Market/Broker

Page 24 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ William H. Patterson's IRA 8/21/2007 Buy 9 52.8600 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.8700 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.8800 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 1 52.8900 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 6 52.9000 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 2 52.9800 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 4 52.9900 Open Market/Broker William H. Patterson's IRA 8/21/2007 Buy 4 53.0000 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 293 52.1700 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 572 52.1800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 293 52.1900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 859 52.2000 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 98 52.2050 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,149 52.2100 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 98 52.2200 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,622 52.2300 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 98 52.2350 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,856 52.2400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 3,244 52.2500 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,728 52.2600 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,270 52.2700 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,515 52.2800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,779 52.2900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 21,980 52.3000 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 684 52.3100 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 4,249 52.3200 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 3,385 52.3300 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 5,106 52.3400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 8,602 52.3500 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,137 52.3600 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,088 52.3700 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 3,576 52.3800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 7,773 52.3900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 10,637 52.4000 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,612 52.4100 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 3,317 52.4200 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 800 52.4300 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,071 52.4400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,411 52.4500 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,470 52.4600 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 497 52.4700 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 365 52.4800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 754 52.4900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,192 52.5000 Open Market/Broker

Page 25 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 8/22/2007 Buy 2,322 52.5100 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,458 52.5200 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 352 52.5300 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 47 52.5400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 302 52.5500 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 51 52.5600 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 488 52.5800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 195 52.6000 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 293 52.6100 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 781 52.6200 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 98 52.6300 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 684 52.6400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 398 52.6500 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 5,762 52.6600 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,488 52.6700 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,579 52.6800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 7,063 52.6900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,434 52.7000 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 219 52.7100 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 379 52.7200 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 971 52.7300 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,804 52.7400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 2,344 52.7500 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,465 52.7600 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 6,451 52.7700 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 1,222 52.7800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 198 52.7900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 81 52.8400 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 121 52.8800 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 98 52.8900 Open Market/Broker SPO Partners II, L.P. 8/22/2007 Buy 172 52.9000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 7 52.1700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 13 52.1800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 7 52.1900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 20 52.2000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 2 52.2050 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 50 52.2100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 2 52.2200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 38 52.2300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 2 52.2350 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 43 52.2400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 75 52.2500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 40 52.2600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 29 52.2700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 35 52.2800 Open Market/Broker

Page 26 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 8/22/2007 Buy 65 52.2900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 510 52.3000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 16 52.3100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 99 52.3200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 79 52.3300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 119 52.3400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 200 52.3500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 50 52.3600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 48 52.3700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 83 52.3800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 180 52.3900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 247 52.4000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 61 52.4100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 77 52.4200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 19 52.4300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 48 52.4400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 56 52.4500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 34 52.4600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 12 52.4700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 8 52.4800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 17 52.4900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 28 52.5000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 53 52.5100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 34 52.5200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 8 52.5300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 1 52.5400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 7 52.5500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 1 52.5600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 11 52.5800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 5 52.6000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 7 52.6100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 18 52.6200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 2 52.6300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 16 52.6400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 9 52.6500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 134 52.6600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 57 52.6700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 37 52.6800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 164 52.6900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 56 52.7000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 5 52.7100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 9 52.7200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 23 52.7300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 42 52.7400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 54 52.7500 Open Market/Broker

Page 27 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 8/22/2007 Buy 34 52.7600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 150 52.7700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 28 52.7800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 5 52.7900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 2 52.8400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 3 52.8800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 2 52.8900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/22/2007 Buy 4 52.9000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.1800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.2500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.2800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.2900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 15 52.3000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 3 52.3200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.3300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 3 52.3400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 6 52.3500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.3600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.3700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.3800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 6 52.3900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 7 52.4000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.4100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.4200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.4300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.4400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.4600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.4800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.4900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.5000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.5100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.5200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.5800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.6200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.6500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 4 52.6600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.6700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.6800 Open Market/Broker

Page 28 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 5 52.6900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.7000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.7400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 2 52.7500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.7600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 4 52.7700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.7800 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 98 52.3500 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 293 52.3600 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 195 52.3800 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 339 52.4000 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 107 52.4100 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 488 52.4200 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 98 52.4400 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 2,813 52.4500 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 976 52.4600 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 390 52.4700 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 683 52.4800 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 438 52.4900 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 6,074 52.5000 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 436 52.5100 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 959 52.5200 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 488 52.5300 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 683 52.5400 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 957 52.5500 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 2,528 52.5600 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 4,492 52.5700 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 1,737 52.5800 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 1,757 52.5900 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 83,809 52.6000 Open Market/Broker SPO Partners II, L.P. 8/23/2007 Buy 62 52.6700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 2 52.3500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 7 52.3600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 5 52.3800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 8 52.4000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 3 52.4100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 12 52.4200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 2 52.4400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 65 52.4500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 23 52.4600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 10 52.4700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 16 52.4800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 11 52.4900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 143 52.5000 Open Market/Broker

Page 29 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 8/23/2007 Buy 10 52.5100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 22 52.5200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 11 52.5300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 16 52.5400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 22 52.5500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 59 52.5600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 105 52.5700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 41 52.5800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 41 52.5900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 1,965 52.6000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/23/2007 Buy 1 52.6700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 3 52.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.4600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.4800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 5 52.5000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.5100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.5200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.5300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.5400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.5500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 3 52.5600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 4 52.5700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 1 52.5800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 2 52.5900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/23/2007 Buy 75 52.6000 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 1,877 52.6500 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 195 52.6600 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 195 52.6800 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 1,270 52.6900 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 684 52.7000 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 368 52.7100 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 489 52.7200 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 1,038 52.7300 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 2,110 52.7400 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 8,772 52.7500 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 986 52.7600 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 2,507 52.7700 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 1,466 52.7800 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 1,199 52.7900 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 1,545 52.8000 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 625 52.8100 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 489 52.8700 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 293 52.8900 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 3,204 52.9000 Open Market/Broker

Page 30 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 8/24/2007 Buy 293 52.9200 Open Market/Broker SPO Partners II, L.P. 8/24/2007 Buy 195 52.9300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 44 52.6500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 5 52.6600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 5 52.6800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 30 52.6900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 16 52.7000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 9 52.7100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 11 52.7200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 24 52.7300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 50 52.7400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 206 52.7500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 23 52.7600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 59 52.7700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 34 52.7800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 28 52.7900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 36 52.8000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 15 52.8100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 11 52.8700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 7 52.8900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 75 52.9000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 7 52.9200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/24/2007 Buy 5 52.9300 Open Market/Broker SPO Partners II, L.P. 8/27/2007 Buy 16,300 52.9500 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 61 52.1800 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 2,369 52.1900 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 1,664 52.2000 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 498 52.2400 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 22,649 52.2500 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 17,406 52.3000 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 3,204 52.3100 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 195 52.3200 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 6,941 52.3500 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 293 52.3600 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 1,390 52.3700 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 195 52.3800 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 8,534 52.4000 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 28 52.4100 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 847 52.4200 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 14,638 52.4300 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 1,459 52.4400 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 14,939 52.4500 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 1,459 52.4600 Open Market/Broker

Page 31 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 8/28/2007 Buy 820 52.4700 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 4,040 52.4800 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 195 52.4900 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 8,703 52.5000 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 195 52.5400 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 2,714 52.5500 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 1,772 52.5600 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 488 52.5900 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 9,147 52.6000 Open Market/Broker SPO Partners II, L.P. 8/28/2007 Buy 9,757 52.6500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 1 52.1800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 55 52.1900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 39 52.2000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 11 52.2400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 531 52.2500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 408 52.3000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 75 52.3100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 5 52.3200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 163 52.3500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 7 52.3600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 33 52.3700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 5 52.3800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 200 52.4000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 1 52.4100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 20 52.4200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 343 52.4300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 34 52.4400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 350 52.4500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 34 52.4600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 19 52.4700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 95 52.4800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 5 52.4900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 204 52.5000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 5 52.5400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 64 52.5500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 41 52.5600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 11 52.5900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 214 52.6000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/28/2007 Buy 227 52.6500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 4 52.1900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 2 52.2000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 1 52.2400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 33 52.2500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 25 52.3000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 5 52.3100 Open Market/Broker

Page 32 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 10 52.3500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 2 52.3700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 12 52.4000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 1 52.4200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 21 52.4300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 2 52.4400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 22 52.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 2 52.4600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 1 52.4700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 6 52.4800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 13 52.5000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 4 52.5500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 3 52.5600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 1 52.5900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 14 52.6000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/28/2007 Buy 16 52.6500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 471 51.7600 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 283 51.7700 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,023 51.8000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 377 51.8100 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 471 51.8200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 920 51.8300 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 283 51.8400 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 754 51.8500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 544 51.8800 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 51.8900 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 210 51.9000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 283 51.9050 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 471 51.9100 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 566 51.9200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,131 51.9250 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,226 51.9300 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 768 51.9400 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 4,948 51.9500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 3,299 51.9600 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 6,316 51.9700 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 24,040 51.9750 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 34 51.9800 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,697 51.9900 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 4,997 52.0000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.1175 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.1200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.1250 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.1300 Open Market/Broker

Page 33 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 8/29/2007 Buy 189 52.1350 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.1400 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 283 52.1500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 566 52.1700 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 566 52.1800 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 226 52.2000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.2100 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,508 52.2200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 999 52.2300 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 754 52.2400 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 999 52.2500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 132 52.2600 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,131 52.2700 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 283 52.2800 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 844 52.2900 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.2950 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,131 52.3000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 419 52.3100 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.3300 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 660 52.3400 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 377 52.3600 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 283 52.3700 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.4200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.4300 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 754 52.4500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.4900 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,697 52.5000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 566 52.6200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.6300 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 477 52.6400 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 840 52.6500 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 286 52.6600 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 85 52.6700 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 754 52.6900 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 189 52.7000 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 1,367 52.7100 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.7150 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.7200 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.7250 Open Market/Broker SPO Partners II, L.P. 8/29/2007 Buy 94 52.7400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 28 51.7600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 16 51.7700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 59 51.8000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 22 51.8100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 28 51.8200 Open Market/Broker

Page 34 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 8/29/2007 Buy 54 51.8300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 16 51.8400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 44 51.8500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 32 51.8800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 51.8900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 12 51.9000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 16 51.9050 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 28 51.9100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 33 51.9200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 66 51.9250 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 71 51.9300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 45 51.9400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 288 51.9500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 192 51.9600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 367 51.9700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 1,397 51.9750 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 2 51.9800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 99 51.9900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 290 52.0000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.1175 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.1200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.1250 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.1300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.1350 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.1400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 16 52.1500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 33 52.1700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 33 52.1800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 13 52.2000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.2100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 88 52.2200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 58 52.2300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 44 52.2400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 58 52.2500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 8 52.2600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 66 52.2700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 16 52.2800 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 49 52.2900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.2950 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 66 52.3000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 24 52.3100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.3300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 38 52.3400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 22 52.3600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 16 52.3700 Open Market/Broker

Page 35 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.4200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.4300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 44 52.4500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.4900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 99 52.5000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 33 52.6200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.6300 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 28 52.6400 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 49 52.6500 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 17 52.6600 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.6700 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 44 52.6900 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 11 52.7000 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 79 52.7100 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.7150 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.7200 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.7250 Open Market/Broker Phoebe Snow Foundation, Inc. 8/29/2007 Buy 5 52.7400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.7600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.7700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 51.8000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.8100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.8200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 51.8300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.8400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 51.8500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.8800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.9000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.9050 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.9100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 51.9200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 51.9250 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 51.9300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 51.9400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 13 51.9500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 9 51.9600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 17 51.9700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 63 51.9750 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 4 51.9900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 13 52.0000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.1175 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.1200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.1250 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.1500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.1700 Open Market/Broker

Page 36 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.1800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.2000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 4 52.2200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 52.2300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 52.2400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 52.2500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 52.2700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.2800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 52.2900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.2950 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 3 52.3000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/22/2007 Buy 1 52.3100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 52.3400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.3600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.3700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.4200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 52.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 4 52.5000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.6200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.6300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.6400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 52.6500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 2 52.6900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 4 52.7100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.7150 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.7200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.7250 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 8/29/2007 Buy 1 52.7400 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 168 47.3600 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 185 47.3700 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 18 47.3800 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 278 47.4000 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 370 47.4100 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 278 47.4300 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.4400 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 4,244 47.4500 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,575 47.4600 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 2,038 47.4700 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 185 47.4800 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,128 47.4900 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 370 47.5000 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 649 47.6200 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 278 47.6300 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.6400 Open Market/Broker

Page 37 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 9/26/2007 Buy 1,111 47.6500 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 278 47.7000 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 463 47.7400 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,945 47.7500 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 3,334 47.7600 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 2,872 47.7700 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 7,400 47.7800 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 2,861 47.7900 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 186 47.7950 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 5,541 47.8000 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.8050 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,668 47.8100 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,852 47.8200 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,389 47.8300 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 5,226 47.8400 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 463 47.8500 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,296 47.8600 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 834 47.8700 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 463 47.8800 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 177 47.8900 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.8950 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 3,983 47.9000 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 371 47.9100 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 463 47.9200 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.9250 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,398 47.9300 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,575 47.9400 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.9450 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 6,975 47.9500 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 93 47.9600 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 1,112 47.9800 Open Market/Broker SPO Partners II, L.P. 9/26/2007 Buy 278 47.9900 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 9 47.3600 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 10 47.3700 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 1 47.3800 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 15 47.4000 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 20 47.4100 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 15 47.4300 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.4400 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 231 47.4500 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 86 47.4600 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 111 47.4700 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 10 47.4800 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 62 47.4900 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 20 47.5000 Open Market/Broker

Page 38 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ San Francisco Partners II, L.P. 9/26/2007 Buy 35 47.6200 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 15 47.6300 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.6400 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 61 47.6500 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 15 47.7000 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 25 47.7400 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 106 47.7500 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 182 47.7600 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 156 47.7700 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 403 47.7800 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 156 47.7900 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 10 47.7950 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 302 47.8000 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.8050 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 91 47.8100 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 101 47.8200 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 76 47.8300 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 285 47.8400 Open Market/Broke San Francisco Partners II, L.P. 9/26/2007 Buy 25 47.8500 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 71 47.8600 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 45 47.8700 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 25 47.8800 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 10 47.8900 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.8950 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 217 47.9000 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 20 47.9100 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 25 47.9200 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.9250 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 76 47.9300 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 86 47.9400 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.9450 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 380 47.9500 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 5 47.9600 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 61 47.9800 Open Market/Broker San Francisco Partners II, L.P. 9/26/2007 Buy 15 47.9900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 4 47.3600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 4 47.3700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 7 47.4000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 9 47.4100 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 7 47.4300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.4400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 100 47.4500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 37 47.4600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 48 47.4700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 4 47.4800 Open Market/Broker

Page 39 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 9/26/2007 Buy 27 47.4900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 9 47.5000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 15 47.6200 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 7 47.6300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.6400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 26 47.6500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 7 47.7000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 11 47.7400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 46 47.7500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 79 47.7600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 68 47.7700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 174 47.7800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 67 47.7900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 4 47.7950 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 131 47.8000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.8050 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 39 47.8100 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 44 47.8200 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 33 47.8300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 123 47.8400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 11 47.8500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 31 47.8600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 20 47.8700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 11 47.8800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 4 47.8900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.8950 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 94 47.9000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 8 47.9100 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 11 47.9200 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.9250 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 33 47.9300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 37 47.9400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.9450 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 164 47.9500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 2 47.9600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 25 47.9800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/26/2007 Buy 7 47.9900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.3700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.4100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 6 47.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.4600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 3 47.4700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.4800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.4900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.5000 Open Market/Broker

Page 40 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.6200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.6500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.7400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 3 47.7500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 5 47.7600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 4 47.7700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 11 47.7800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 4 47.7900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 8 47.8000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.8100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 3 47.8200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.8300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 8 47.8400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.8500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.8600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.8700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.8800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 6 47.9000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.9100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 1 47.9200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.9300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.9400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 10 47.9500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/26/2007 Buy 2 47.9800 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 93 48.9800 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 185 49.0100 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 93 49.0200 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 554 49.0300 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 370 49.0400 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 92 49.0500 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 933 49.0600 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 462 49.0700 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 545 49.0800 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 924 49.0900 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 3,696 49.1000 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 4,285 49.1100 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 8,047 49.1200 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 3,850 49.1300 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 4,648 49.1400 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 7,137 49.1500 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 7,300 49.1600 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 7,305 49.1700 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 5,409 49.1800 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 5,563 49.1900 Open Market/Broker

Page 41 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ SPO Partners II, L.P. 9/27/2007 Buy 10,258 49.2000 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 3,000 49.2100 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 221 49.2200 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 1,940 49.2300 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 185 49.2400 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 670 49.2500 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 1,419 49.2600 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 2,680 49.2700 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 2,809 49.2800 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 2,365 49.2900 Open Market/Broker SPO Partners II, L.P. 9/27/2007 Buy 462 49.3000 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 5 48.9800 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 10 49.0100 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 5 49.0200 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 30 49.0300 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 20 49.0400 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 6 49.0500 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 51 49.0600 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 25 49.0700 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 30 49.0800 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 51 49.0900 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 203 49.1000 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 235 49.1100 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 441 49.1200 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 211 49.1300 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 255 49.1400 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 392 49.1500 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 400 49.1600 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 401 49.1700 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 297 49.1800 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 305 49.1900 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 563 49.2000 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 165 49.2100 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 12 49.2200 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 106 49.2300 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 10 49.2400 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 37 49.2500 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 78 49.2600 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 147 49.2700 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 154 49.2800 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 130 49.2900 Open Market/Broker San Francisco Partners II, L.P. 9/27/2007 Buy 25 49.3000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 2 48.9800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 5 49.0100 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 2 49.0200 Open Market/Broker

Page 42 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ Phoebe Snow Foundation, Inc. 9/27/2007 Buy 15 49.0300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 10 49.0400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 2 49.0500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 25 49.0600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 12 49.0700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 14 49.0800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 24 49.0900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 97 49.1000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 113 49.1100 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 212 49.1200 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 101 49.1300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 122 49.1400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 188 49.1500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 192 49.1600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 192 49.1700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 142 49.1800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 146 49.1900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 270 49.2000 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 79 49.2100 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 6 49.2200 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 51 49.2300 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 5 49.2400 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 18 49.2500 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 37 49.2600 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 70 49.2700 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 74 49.2800 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 62 49.2900 Open Market/Broker Phoebe Snow Foundation, Inc. 9/27/2007 Buy 12 49.3000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 1 49.0300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 1 49.0600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 1 49.0700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 1 49.0800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 1 49.0900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 4 49.1000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 5 49.1100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 9 49.1200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 5 49.1300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 6 49.1400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 7 49.1500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 9 49.1600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 8 49.1700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 6 49.1800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 7 49.1900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 11 49.2000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 3 49.2100 Open Market/Broker

Page 43 of 44 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Reporting Person Date of Type Number of Price Per Where/How Transaction Shares Share ($) Transaction Effected - ------------------------------------------------------------------------------------------------------------------------------------ The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 3 49.2300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 2 49.2600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 3 49.2700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 3 49.2800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 3 49.2900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 9/27/2007 Buy 1 49.3000 Open Market/Broker

Page 44 of 44 pages EXHIBIT INDEX EXHIBIT DOCUMENT DESCRIPTION - ------- -------------------- A Agreement Pursuant to Rule 13d-1 (k) B Powers of Attorney (previously filed) C Power of Attorney

                                    EXHIBIT A

         Pursuant to Rule 13d-1(k) of Regulation 13D-G of the General Rules and
Regulations of the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended, the undersigned agrees that the statement to
which this Exhibit is attached is filed on behalf of each of them in the
capacities set forth below.

Dated:  October 1, 2007

                                         By: /s/ Kim M. Silva
                                             --------------------------
                                             Kim M. Silva

                                         Attorney-in-Fact for:

                                         SPO PARTNERS II, L.P.(1)
                                         SPO ADVISORY PARTNERS, L.P.(1)
                                         SAN FRANCISCO PARTNERS II, L.P.(1)
                                         SF ADVISORY PARTNERS, L.P.(1)
                                         SPO ADVISORY CORP.(1)
                                         JOHN H. SCULLY(1)
                                         WILLIAM E. OBERNDORF(1)
                                         WILLIAM J. PATTERSON(1)
                                         PHOEBE SNOW FOUNDATION, INC.(1)
                                         THE ELIZABETH R. & WILLIAM J.
                                            PATTERSON FOUNDATION(1)
                                         ELI J. WEINBERG(1)
                                         IAN R. McGUIRE(2)

                                         (1) A Power of Attorney
                                         authorizing Kim M. Silva to
                                         act on behalf of this
                                         person or entity has been
                                         previously filed with the
                                         Securities and Exchange
                                         Commission.

                                         (2) A Power of Attorney
                                         authorizing Kim M. Silva to
                                         act on behalf of this
                                         person or entity is filed as
                                         Exhibit C.

POWER OF ATTORNEY EXHIBIT C KNOW ALL PERSONS BY THESE PRESENTS, that Ian R. McGuire (a "Grantor") has made, constituted and appointed, and by these presents does make, constitute and appoint, each of William E. Oberndorf and Kim M. Silva (each an "Attorney"), the true and lawful agent and attorney-in-fact, with full power of substitution and resubstitution, of the Grantor, for and in Grantor's name, place and stead, in any and all capacities, to do all or any of the following acts, matters and things: 1. To sign on behalf of the Grantor statements on Schedule 13D or 13G or Forms 3, 4 and 5, or amendments thereto pursuant to Section 13(d) or Section 16 under the Securities Exchange Act of 1934. 2. To do all such other acts and things as, in such Attorney's discretion, he or she deems appropriate or desirable for the purpose of filing such statements on Schedule 13D or 13G or Forms 3, 4 and 5, or amendments thereto. 3. To appoint in writing one or more substitutes who shall have the power to act on behalf of the Grantor as if that substitute or those substitutes shall have been originally appointed Attorney (s) by this Power of Attorney and/or to revoke any such appointment at any time without assigning any reason therefor. The Grantor hereby ratifies and confirms all that said agents and attorneys-in-fact or any substitute or substitutes may lawfully do or cause to be done by virtue hereof. This power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 or to file reports under Section 13(d) of the Securities Exchange Act of 1934 with respect to the undersigned's holdings of and transactions in securities issued by Lamar Advertising Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact. The words Grantor and Attorney shall include all grantors and attorneys under this Power of Attorney. IN WITNESS WHEREOF, Grantor duly assents to this Power of Attorney by his, her or its signature as of the 1st day of October, 2007.

IAN R. McGUIRE /s/ Ian R. McGuire ----------------------------------