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Derivative Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commodity derivative assets
Gross amounts on balance sheet	$ 1,621,665	$ 887,034
Gross amounts offset on balance sheet	(29,114)	(26,254)
Total asset derivatives	1,592,551us-gaap_DerivativeAssets	860,780us-gaap_DerivativeAssets
Commodity derivative liabilities
Gross amounts on balance sheet		(646)
Total liability derivatives		(646)us-gaap_DerivativeLiabilities
Net fair value of commodity derivative assets position
Commodity derivative assets
Total asset derivatives	1,592,551	860,780
Commodity derivative liabilities
Total liability derivatives		$ (646)

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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