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Fair Value Measurements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative asset net fair value	$ 160,217,000us-gaap_DerivativeAssets	$ 12,138,000us-gaap_DerivativeAssets
Total derivative liability net fair value	(6,914,000)us-gaap_DerivativeLiabilities	(22,897,000)us-gaap_DerivativeLiabilities
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative asset net fair value	191,800,000	25,400,000
Total derivative liability net fair value	(38,500,000)	(36,200,000)
Total	153,300,000	(10,800,000)
Recurring \| Using Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative asset net fair value	191,800,000	25,400,000
Total derivative liability net fair value	(38,500,000)	(36,200,000)
Total	$ 153,300,000	$ (10,800,000)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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