1001 - Document - Document and Entity Information
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1002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS
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1003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
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1004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
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1005 - Statement - CONDENSED CONSOLIDATED STATEMENT OF EQUITY
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1006 - Statement - CONDENSED CONSOLIDATED STATEMENT OF EQUITY (Parenthetical)
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1007 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
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1008 - Disclosure - Basis of Presentation
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1009 - Disclosure - Acquisitions and Dispositions
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1010 - Disclosure - Additional Balance Sheet Information
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1011 - Disclosure - Property and Equipment
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1012 - Disclosure - Long-Term Debt
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1013 - Disclosure - Other Long-Term Obligations and Commitments
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1014 - Disclosure - Contingent Liabilities
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1015 - Disclosure - Stock Options and Other Compensation
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1016 - Disclosure - Related Party Transactions
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1017 - Disclosure - Financial Instruments
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1018 - Disclosure - Earnings per Share
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1019 - Disclosure - Basis of Presentation (Policies)
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1020 - Disclosure - Additional Balance Sheet Information (Tables)
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1021 - Disclosure - Property and Equipment (Tables)
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1022 - Disclosure - Other Long-Term Obligations and Commitments (Tables)
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1023 - Disclosure - Financial Instruments (Tables)
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1024 - Disclosure - Earnings per Share (Tables)
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1025 - Disclosure - Basis of Presentation - Additional Information (Detail)
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1026 - Disclosure - Acquisitions and Dispositions - Additional Information (Detail)
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1027 - Disclosure - Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail)
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1028 - Disclosure - Property and Equipment - Components of Property and Equipment (Detail)
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1029 - Disclosure - Long-Term Debt - Additional Information (Detail)
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1030 - Disclosure - Other Long-Term Obligations and Commitments - Additional Information (Detail)
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1031 - Disclosure - Other Long-Term Obligations and Commitments - Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases (Detail)
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1032 - Disclosure - Other Long-Term Obligations and Commitments - Reconciliation of Liability for Plugging and Abandonment Costs (Detail)
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1033 - Disclosure - Stock Options and Other Compensation - Additional Information (Detail)
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1034 - Disclosure - Related Party Transactions - Additional Information (Detail)
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1035 - Disclosure - Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)
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1036 - Disclosure - Financial Instruments - Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 (Detail)
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1037 - Disclosure - Financial Instruments - Effect of Derivative Instruments on Consolidated Balance Sheets (Detail)
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1038 - Disclosure - Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail)
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1039 - Disclosure - Earnings per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail)
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1040 - Disclosure - Earnings Per Share - Additional Information (Detail)
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1041 - Statement - Other Long-Term Obligations and Commitments - Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases (Detail) Alternate 1
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