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Derivative Financial Instruments Fair Value (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | --- | ---
Fair value of derivative assets and liabilities |  |  |
Derivative asset | $ 43,305,000 | $ 37,873,000 |
Derivative asset | 28,659,000 | 16,466,000 |
Derivative liability | 22,648,000 | 8,999,000 |
Derivatives liability | 6,873,000 | 6,645,000 |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 71,964,000 | 54,339,000 |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (29,225,000) | (13,400,000) |
Derivative Asset, Fair Value, Amount Offset Against Collateral, Net | 42,739,000 | 40,939,000 |
Derivative Liability, Fair Value, Amount Offset Against Collateral | (29,521,000) | (15,644,000) |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 29,225,000 | 13,400,000 |
Derivative Liability, Fair Value, Amount Offset Against Collateral, Net | (296,000) | (2,244,000) |
Fair value of oil, natural gas, NGL commodity derivative markets | 42,400,000 |  | 38,700,000
Derivatives not designated as hedging instruments |  |  |
Fair value of derivative assets and liabilities |  |  |
Derivative asset | 43,305,000 | 37,873,000 |
Derivative asset | 28,659,000 | 16,466,000 |
Derivative liability | 22,648,000 | 8,999,000 |
Derivatives liability | 6,873,000 | 6,645,000 |
Level 2 | Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] |  |  |
Fair value of derivative assets and liabilities |  |  |
Derivative assets not designated as hedging instruments | 71,964,000 | 54,339,000 |
Derivative liabilities not designated as hedging instruments | $ 29,521,000 | $ 15,644,000 |

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