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Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative instruments carried at fair value in Condensed Consolidated Balance Sheet
Total carrying value of derivative assets in Condensed Consolidated Balance Sheet	$ 20,265	$ 30,382
Total carrying value of derivative liabilities in Condensed Consolidated Balance Sheet	(50,523)	(59,419)
Recurring \| Significant other observable inputs (Level 2) \| Commodity contracts
Derivative instruments carried at fair value in Condensed Consolidated Balance Sheet
Total carrying value of derivative assets in Condensed Consolidated Balance Sheet	3,518	8,441
Total carrying value of derivative liabilities in Condensed Consolidated Balance Sheet	(11,615)	(15,970)
Recurring \| Significant unobservable inputs (Level 3) \| Commodity contracts
Derivative instruments carried at fair value in Condensed Consolidated Balance Sheet
Total carrying value of derivative assets in Condensed Consolidated Balance Sheet	13,401	15,795
Total carrying value of derivative liabilities in Condensed Consolidated Balance Sheet	(10,458)	(3,346)
Recurring \| Significant unobservable inputs (Level 3) \| Embedded derivatives in commodity contracts
Derivative instruments carried at fair value in Condensed Consolidated Balance Sheet
Total carrying value of derivative assets in Condensed Consolidated Balance Sheet	3,346	6,146
Total carrying value of derivative liabilities in Condensed Consolidated Balance Sheet	$ (28,450)	$ (40,103)

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 assets not subject to a master netting arrangement and not elected to be offset.

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