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Derivative Financial Instruments Fair Value (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Fair value of derivative assets and liabilities |  |
Price Risk Derivatives, at Fair Value, Net | $ 21,500,000 | $ 38,700,000
Derivative Assets, Current | 21,559,000 | 37,873,000
Derivative Liabilities, Current | 26,380,000 | 8,999,000
Derivative Assets, Noncurrent | 30,951,000 | 16,466,000
Derivative Liabilities, Noncurrent | 4,640,000 | 6,645,000
Derivative Asset, Fair Value, Amount Offset Against Collateral | 52,510,000 | 54,339,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (30,652,000) | (13,400,000)
Derivative Asset, Fair Value, Amount Offset Against Collateral, Net | 21,858,000 | 40,939,000
Derivative Liability, Fair Value, Amount Offset Against Collateral | (31,020,000) | (15,644,000)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 30,652,000 | 13,400,000
Derivative Liability, Fair Value, Amount Offset Against Collateral, Net | (368,000) | (2,244,000)
Not Designated as Hedging Instrument [Member] |  |
Fair value of derivative assets and liabilities |  |
Derivative Assets, Current | 21,559,000 | 37,873,000
Derivative Liabilities, Current | 26,380,000 | 8,999,000
Derivative Assets, Noncurrent | 30,951,000 | 16,466,000
Derivative Liabilities, Noncurrent | 4,640,000 | 6,645,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair value of derivative assets and liabilities |  |
Fair Value: Derivative Assets | 52,510,000 | 54,339,000
Fair Value: Derivative Liabilities | $ 31,020,000 | $ 15,644,000

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