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SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 5)* 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) March 18, 2008 (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 32 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 11,654,569 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 11,654,569 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,654,569 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [_] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 14.9% - -------------------------------------------------------------------------------- 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 32 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 11,654,569 (1)(2) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 11,654,569 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,654,569 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [_] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 14.9% - -------------------------------------------------------------------------------- 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 32 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 504,530 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 504,530 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 504,530 - -------------------------------------------------------------------------------- 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 32 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 504,530 (1)(2) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 504,530 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 504,530 - -------------------------------------------------------------------------------- 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 32 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 12,159,099 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 12,159,099 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 12,159,099 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [_] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.5% - -------------------------------------------------------------------------------- 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 11,654,569 of such shares; and solely in its capacity as the sole general partner of SF Advisory Partners, L.P. with respect to 504,530 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 32 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 235,300 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 12,159,099 (2) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 235,300 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 12,159,099 (2) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 12,394,399 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [_] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.8% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) Of these shares, 4,200 shares are held in the John H. Scully Individual Retirement Accounts, which are self-directed, and 231,100 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 32 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 12,159,099 (1) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 12,159,099 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 12,159,099 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [_] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.5% - -------------------------------------------------------------------------------- 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 32 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 600 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 12,200,799 (2) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 600 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 12,200,799 (2) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 12,201,399 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [_] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.6% - -------------------------------------------------------------------------------- 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, 12,159,099 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 41,700 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 32 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 231,100 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 231,100 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 231,100 - -------------------------------------------------------------------------------- 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 32 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 41,700 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 41,700 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 41,700 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- (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 32 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 32 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 32 pages This Amendment No. 5 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, July 31, 2007 and October 2, 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 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 $520,409,684 SPO Advisory Partners Not Applicable Not Applicable SFP Contributions from Partners $22,204,996 SF Advisory Partners Not Applicable Not Applicable SPO Advisory Corp. Not Applicable Not Applicable JHS Not Applicable and Personal Funds $226,053 WEO Not Applicable Not Applicable WJP Not Applicable and Personal Funds $26,824 PS Foundation Contributions from Shareholders $13,108,343 Patterson Foundation Contributions from Shareholders $1,664,851 EJW Personal Funds $5,282 IRM Personal Funds $55,943 ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. (a) Percentage interest calculations for each Reporting Person are based upon the Issuer having 78,367,063 total outstanding shares of Class A common stock as reported on the Issuer's 10-K filed with the Securities and Exchange Commission on February 28, 2008. SPO The aggregate number of Shares that SPO owns beneficially, pursuant to Rule 13d-3 of the Act, is 11,654,569 Shares, which constitutes approximately 14.9% 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 11,654,569 Shares, which constitutes approximately 14.9% of the outstanding Shares. SFP The aggregate number of Shares that SFP owns beneficially, pursuant to Rule 13d-3 of the Act, is 504,530 Shares, which constitutes approximately 0.6% of the outstanding Shares.

Page 14 of 32 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 504,530 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 12,159,099 Shares in the aggregate, which constitutes approximately 15.5% 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 12,394,399 Shares, which constitutes approximately 15.8% 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 12,159,099 Shares, which constitutes approximately 15.5% 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 12,201,399 Shares, which constitutes approximately 15.6% 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 231,100 Shares, which constitutes approximately 0.3% of the outstanding Shares.

Page 15 of 32 pages PATTERSON FOUNDATION The aggregate number of Shares that Patterson Foundation owns beneficially, pursuant to Rule 13d-3 of the Act, is 41,700 Shares, which constitutes approximately 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 11,654,569 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 11,654,569 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 504,530 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 504,530 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 12,159,099 Shares in the aggregate.

Page 16 of 32 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 12,159,099 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 4,200 Shares held in the John H. Scully Individual Retirement Accounts, which are self-directed individual retirement accounts, and 231,100 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 12,159,099 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 12,159,099 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 41,700 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 600 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 231,100 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 41,700 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 17 of 32 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)

Page 18 of 32 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 March 20, 2008 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(1) (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.

Page 19 of 32 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. 3/18/2008 Buy 97 33.6000 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 97,438 33.6500 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 43,652 33.6550 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 390 33.7300 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 9,646 33.7400 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 120,042 33.7500 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 487 33.7600 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 292 33.7700 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 292 33.7800 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 1,559 33.7900 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 3,410 33.8008 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 7,308 33.8053 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 585 33.8200 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 1,169 33.8300 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 487 33.8400 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 292 33.8500 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 585 33.8600 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 1,364 33.8700 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 585 33.8800 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 5,164 33.8900 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 8,574 33.9027 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 5,651 33.9130 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 7,795 33.9200 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 8,477 33.9300 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 2,533 33.9425 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 7,113 33.9500 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 585 34.3300 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 1,169 34.4000 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 1,169 34.4200 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 585 34.4425 Open Market/Broker SPO Partners II, L.P. 3/18/2008 Buy 3,605 34.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 3 33.6000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 2,506 33.6500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 1,122 33.6550 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 10 33.7300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 248 33.7400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 3,088 33.7500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 13 33.7600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 8 33.7700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 8 33.7800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 40 33.7900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 88 33.8008 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 188 33.8053 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 15 33.8200 Open Market/Broker

Page 20 of 32 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 3/18/2008 Buy 30 33.8300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 13 33.8400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 8 33.8500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 15 33.8600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 35 33.8700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 15 33.8800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 132 33.8900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 220 33.9027 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 145 33.9130 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 201 33.9200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 218 33.9300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 65 33.9425 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 183 33.9500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 15 34.3300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 30 34.4000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 30 34.4200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 15 34.4425 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/18/2008 Buy 93 34.4500 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.6000 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 28 33.6500 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 13 33.6550 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.7300 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 3 33.7400 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 35 33.7500 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.7600 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.7700 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.7800 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 1 33.7900 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 1 33.8008 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 2 33.8053 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.8200 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 1 33.8300 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.8400 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.8500 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.8600 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 1 33.8700 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 33.8800 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 2 33.8900 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 3 33.9027 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 2 33.9130 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 2 33.9200 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 2 33.9300 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 1 33.9425 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 2 33.9500 Open Market/Broker

Page 21 of 32 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 - ------------------------------------------------------------------------------------------------------------------------------------ John H. Scully SEP IRA 3/18/2008 Buy - 34.3300 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 34.4000 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 34.4200 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy - 34.4425 Open Market/Broker John H. Scully SEP IRA 3/18/2008 Buy 1 34.4500 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.6000 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 28 33.6500 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 13 33.6550 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.7300 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 3 33.7400 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 35 33.7500 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.7600 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.7700 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.7800 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.7900 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 1 33.8008 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 2 33.8053 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8200 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8300 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8400 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8500 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8600 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8700 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 33.8800 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 2 33.8900 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 3 33.9027 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 2 33.9130 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 2 33.9200 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 3 33.9300 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 1 33.9425 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 2 33.9500 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 34.3300 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 1 34.4000 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 1 34.4200 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy - 34.4425 Open Market/Broker William J. Patterson IRA 3/18/2008 Buy 1 34.4500 Open Market/Broker

Page 22 of 32 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. 3/19/2008 Buy 15,517 33.5200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 6,334 33.7100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 6,236 33.9500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 3,313 34.1200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 195 34.2000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 1,169 34.2200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 390 34.2400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 195 34.3000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 292 34.4300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 390 34.4400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 9,744 34.4900 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 5,458 34.5100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 390 34.5200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 5,233 34.5300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 682 34.5600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 3,410 34.5700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 5,973 34.5800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 15,257 34.5900 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 2,470 34.6000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 2,227 34.6100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 1,851 34.6200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 14,811 34.6300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,872 34.6400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,092 34.6500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 2,475 34.6600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 49,582 34.6700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 6,041 34.6800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 10,523 34.6900 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 11,011 34.7000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 10,104 34.7100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 18,395 34.7200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 23,970 34.7300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 12,136 34.7400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 21,778 34.7500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 8,087 34.7600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 21,969 34.7700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 6,394 34.7800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 3,313 34.7900 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 82,252 34.8000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 52,061 34.8100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 19,196 34.8200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 22,544 34.8300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 16,861 34.8400 Open Market/Broker

Page 23 of 32 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. 3/19/2008 Buy 30,427 34.8500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 16,690 34.8600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,872 34.8700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 2,436 34.8800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 12,864 34.8900 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 1,462 34.9000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 10,252 34.9100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 974 34.9200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 7,600 34.9300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 9,984 34.9400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 59,850 34.9500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 17,633 34.9700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 18,876 34.9800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 11,935 34.9900 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 18,544 35.0000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,872 35.0100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 17,859 35.0300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 16,275 35.0400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 9,814 35.0500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 7,698 35.0600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,968 35.0700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,677 35.0800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 11,626 35.1000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 9,744 35.1500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 3,703 35.1700 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 1,851 35.2000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 5,846 35.2500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,872 35.3000 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,585 35.3200 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 974 35.3300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 585 35.3400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 5,820 35.3500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 97 35.4100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 7,503 35.4500 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 3,995 35.4600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 5,478 35.5100 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 3,021 35.5300 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 2,631 35.5400 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,872 35.5600 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,872 35.5800 Open Market/Broker SPO Partners II, L.P. 3/19/2008 Buy 4,870 35.6000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 399 33.5200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 163 33.7100 Open Market/Broker

Page 24 of 32 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 3/19/2008 Buy 160 33.9500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 85 34.1200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 5 34.2000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 30 34.2200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 10 34.2400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 5 34.3000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 8 34.4300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 10 34.4400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 251 34.4900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 140 34.5100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 10 34.5200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 134 34.5300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 18 34.5600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 88 34.5700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 154 34.5800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 392 34.5900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 63 34.6000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 57 34.6100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 48 34.6200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 381 34.6300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 125 34.6400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 105 34.6500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 63 34.6600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 1,275 34.6700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 155 34.6800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 271 34.6900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 283 34.7000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 260 34.7100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 473 34.7200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 616 34.7300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 312 34.7400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 560 34.7500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 208 34.7600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 565 34.7700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 164 34.7800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 85 34.7900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 2,115 34.8000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 1,339 34.8100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 494 34.8200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 580 34.8300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 434 34.8400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 782 34.8500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 429 34.8600 Open Market/Broker

Page 25 of 32 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 3/19/2008 Buy 125 34.8700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 63 34.8800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 331 34.8900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 38 34.9000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 264 34.9100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 25 34.9200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 195 34.9300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 257 34.9400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 1,539 34.9500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 453 34.9700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 485 34.9800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 307 34.9900 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 477 35.0000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 125 35.0100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 459 35.0300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 418 35.0400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 252 35.0500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 198 35.0600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 128 35.0700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 120 35.0800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 299 35.1000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 251 35.1500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 95 35.1700 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 48 35.2000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 150 35.2500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 125 35.3000 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 118 35.3200 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 25 35.3300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 15 35.3400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 150 35.3500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 3 35.4100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 193 35.4500 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 103 35.4600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 141 35.5100 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 78 35.5300 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 68 35.5400 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 125 35.5600 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 125 35.5800 Open Market/Broker The Elizabeth R. and William J. Patterson Foundation 3/19/2008 Buy 125 35.6000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 5 33.5200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 33.7100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 33.9500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.1200 Open Market/Broker

Page 26 of 32 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 - ------------------------------------------------------------------------------------------------------------------------------------ John H. Scully SEP IRA 3/19/2008 Buy - 34.2000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.2200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.2400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.3000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.4300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.4400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 34.4900 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.5100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.5200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.5300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.5600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.5700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.5800 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 5 34.5900 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.6000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.6100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.6200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 5 34.6300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.6400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.6500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.6600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 17 34.6700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.6800 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 4 34.6900 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 4 34.7000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 34.7100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 34.7200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 8 34.7300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 4 34.7400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 7 34.7500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 34.7600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 7 34.7700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.7800 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.7900 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 28 34.8000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 18 34.8100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 34.8200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 8 34.8300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 34.8400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 10 34.8500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 34.8600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 34.8700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 34.8800 Open Market/Broker

Page 27 of 32 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 - ------------------------------------------------------------------------------------------------------------------------------------ John H. Scully SEP IRA 3/19/2008 Buy 4 34.8900 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.9000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 34.9100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 34.9200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 34.9300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 34.9400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 20 34.9500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 34.9700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 34.9800 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 4 34.9900 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 35.0000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.0100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 35.0300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 6 35.0400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 35.0500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 35.0600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.0700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.0800 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 4 35.1000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 35.1500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 35.1700 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 35.2000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.2500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.3000 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.3200 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 35.3300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 35.3400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.3500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy - 35.4100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 3 35.4500 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 35.4600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.5100 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 35.5300 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 1 35.5400 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.5600 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.5800 Open Market/Broker John H. Scully SEP IRA 3/19/2008 Buy 2 35.6000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 33.5200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 33.7100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 33.9500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.1200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.2000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.2200 Open Market/Broker

Page 28 of 32 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 J. Patterson IRA 3/19/2008 Buy - 34.2400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.3000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.4300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.4400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.4900 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.5100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.5200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.5300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.5600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.5700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.5800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 34.5900 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.6000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.6100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.6200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 34.6300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.6400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.6500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.6600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 11 34.6700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.6800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.6900 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.7000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.7100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 34.7200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 6 34.7300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 34.7400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 5 34.7500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.7600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 5 34.7700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.7800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.7900 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 18 34.8000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 11 34.8100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 34.8200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 34.8300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 34.8400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 8 34.8500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 34.8600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.8700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.8800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 34.8900 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 34.9000 Open Market/Broker

Page 29 of 32 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 J. Patterson IRA 3/19/2008 Buy 2 34.9100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 34.9200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.9300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 34.9400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 14 34.9500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 34.9700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 5 34.9800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 34.9900 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 35.0000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.0100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 35.0300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 4 35.0400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 35.0500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.0600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.0700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.0800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 3 35.1000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 35.1500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.1700 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 35.2000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 2 35.2500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.3000 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 35.3200 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.3300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 35.3400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.3500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 35.4100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.4500 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.4600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.5100 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 35.5300 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy - 35.5400 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.5600 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.5800 Open Market/Broker William J. Patterson IRA 3/19/2008 Buy 1 35.6000 Open Market/Broker

Page 30 of 32 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. 3/20/2008 Buy 4,969 34.4300 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 2,400 34.4500 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 2,300 34.4600 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,400 34.4700 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,700 34.4800 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 7,570 34.4900 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 57,042 34.5000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,506 34.5300 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,300 34.5500 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 395 34.5700 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 10,205 34.5800 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,900 34.5900 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 100 34.6000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 600 34.6100 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,100 34.6200 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,800 34.6300 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,900 34.6400 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 8,290 34.6500 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,200 34.6600 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 600 34.6700 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 7,910 34.6800 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 7,548 34.6900 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 9,252 34.7000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,400 34.7100 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,600 34.7200 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 2,800 34.7300 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 8,322 34.7400 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 15,878 34.7500 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 5,700 34.7600 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,000 34.7700 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,200 34.7800 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 3,400 34.7900 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 10,000 34.8000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 813 34.8200 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 15,400 34.8900 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 500 34.9000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 1,000 35.0000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 900 35.0400 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 5,229 35.0500 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 3,000 35.0600 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 5,200 35.0700 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 9,915 35.0800 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 6,390 35.0900 Open Market/Broker

Page 31 of 32 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. 3/20/2008 Buy 23,219 35.1000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 4,297 35.2500 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 200 35.3000 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 300 35.3100 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 3,650 35.3200 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 300 35.3300 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 700 35.3400 Open Market/Broker SPO Partners II, L.P. 3/20/2008 Buy 400 35.3500 Open Market/Broker

Page 32 of 32 pages EXHIBIT INDEX EXHIBIT DOCUMENT DESCRIPTION - ------- -------------------- A Agreement Pursuant to Rule 13d-1 (k) B Powers of Attorney (previously filed)

                                    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:  March 20, 2008

                                         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(1)

                                         (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.