Derivatives - Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Current Assets: Derivative instruments	$ 115,607us-gaap_DerivativeAssetsCurrent	$ 213us-gaap_DerivativeAssetsCurrent
Noncurrent Assets: Derivative instruments	1,934us-gaap_DerivativeAssetsNoncurrent	218us-gaap_DerivativeAssetsNoncurrent
Total Assets	$ 117,541us-gaap_DerivativeAssets	$ 431us-gaap_DerivativeAssets

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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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, expected to be settled within one year or normal operating cycle, if longer. 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 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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