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Fair Value Measurements - Significant Unobservable Inputs (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Significant Unobservable Inputs |  |
Total net derivative contracts | $ 83,082 | $ 19,992
Fair Value Measurements Level 3 | Oil Basis Swaps |  |
Significant Unobservable Inputs |  |
Derivative, weighted average forward price (in dollars per Bbl) |  | 14.74
Total net derivative contracts | $ 0 | $ (512)
Fair Value Measurements Level 3 | Oil Basis Swaps | Minimum |  |
Significant Unobservable Inputs |  |
Derivative, forward price (in dollars per Bbl) |  | 10.00
Fair Value Measurements Level 3 | Oil Basis Swaps | Maximum |  |
Significant Unobservable Inputs |  |
Derivative, forward price (in dollars per Bbl) |  | 21.98

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