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Fair Value Measurements - Reconciliation of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance of Level 3, Beginning Balance | $ (4,252) | $ (222,554) |  | $ 37,854
Total realized and unrealized gains (losses) | (5,460) | 40,907 |  | (67,412)
Purchases | 5,697 |  |  | 23,196
Settlements (received) paid | 3,503 | 60,127 |  | (216,192)
Transfers |  | 117,268 | [1] |
Balance of Level 3, Ending Balance | (512) | (4,252) |  | (222,554)
Commodity derivatives contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance of Level 3, Beginning Balance | (4,252) | (205,860) |  | 46,153
Total realized and unrealized gains (losses) | (5,460) | 44,075 |  | (50,872)
Purchases | 5,697 |  |  | 23,196
Settlements (received) paid | 3,503 | 50,713 |  | (224,337)
Transfers |  | 106,820 | [1] |
Balance of Level 3, Ending Balance | (512) | (4,252) |  | (205,860)
Interest rate swaps |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance of Level 3, Beginning Balance | 0 | (16,694) |  | (8,299)
Total realized and unrealized gains (losses) | 0 | (3,168) |  | (16,540)
Purchases | 0 |  |  | 0
Settlements (received) paid | 0 | 9,414 |  | 8,145
Transfers |  | 10,448 | [1] |
Balance of Level 3, Ending Balance | $ 0 | $ 0 |  | $ (16,694)
[1] | Fair values related to the Company’s oil and natural gas fixed price swaps, natural gas collars and interest rate swap were transferred from Level 3 to Level 2 in the fourth quarter of 2011 due to enhancements to the Company’s internal valuation process, including the use of observable inputs to assess the fair value. During the years ended December 31, 2012 and 2010, the Company did not have any transfers between Level 1, Level 2 or Level 3 fair value measurements. The Company’s policy is to recognize transfers between fair value hierarchy levels as of the end of the quarterly reporting period in which the event or change in circumstances causing the transfer occurred.

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- Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities + References No definition available. + Details
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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities, Level 3 Transfers, Out of + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities, Purchases + References No definition available. + Details
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- Definition Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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