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Derivative Instruments - Commodity Derivative Gross and Net Information (Details) (Commodity Contract [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commodity Contract [Member]
Offsetting Assets [Line Items]
Derivative assets, gross amounts of recognized assets	$ 331,121	$ 22,743
Derivative assets, gross amounts offset in the balance sheet	(15,614)	(19,146)
Derivative Asset	315,507	3,597
Derivative liabilities, gross amounts of recognized liabilities	15,614	27,473
Derivative liabilities, gross amounts offset in the balance sheet	(15,614)	(19,146)
Derivative Liability	$ 0	$ 8,327

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.

+ References+ Details