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Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financial Statement Impact of Derivative Instruments
Assets	$ 20,265	$ 30,382
Liabilities	(50,523)	(59,419)
Commodity contracts \| Derivative instruments not designated as hedging instruments
Financial Statement Impact of Derivative Instruments
Assets	20,265	30,382
Liabilities	(50,523)	(59,419)
Commodity contracts \| Derivative instruments not designated as hedging instruments \| Current Assets
Financial Statement Impact of Derivative Instruments
Assets	15,710	19,504
Commodity contracts \| Derivative instruments not designated as hedging instruments \| Long-term assets
Financial Statement Impact of Derivative Instruments
Assets	4,555	10,878
Commodity contracts \| Derivative instruments not designated as hedging instruments \| Current Liabilities
Financial Statement Impact of Derivative Instruments
Liabilities	(29,479)	(27,229)
Commodity contracts \| Derivative instruments not designated as hedging instruments \| Long-term liabilities
Financial Statement Impact of Derivative Instruments
Liabilities	$ (21,044)	$ (32,190)

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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