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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Fair value on a recurring basis Fair Value	Dec. 31, 2012 Fair value on a recurring basis Fair Value	Sep. 30, 2013 Fair value on a recurring basis Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2012 Fair value on a recurring basis Quoted prices in active markets for identical assets (Level 1)	Sep. 30, 2013 Fair value on a recurring basis Significant other observable inputs (Level 2)	Dec. 31, 2012 Fair value on a recurring basis Significant other observable inputs (Level 2)	Sep. 30, 2013 Fair value on a recurring basis Significant unobservable inputs (Level 3)	Dec. 31, 2012 Fair value on a recurring basis Significant unobservable inputs (Level 3)
Fair value assets and liabilities measured on a recurring basis
Range of derived market volatilities (as a percent)	21.00%	30.00%
Assets
Derivative instruments, at fair value			$ 203,002	$ 304,237	$ 453	$ 1,228	$ 133,413	$ 204,592	$ 69,136	$ 98,417
Liabilities
Derivative instruments, at fair value			$ 18,353	$ 75,562	$ 647	$ 1,609	$ 16,891	$ 66,250	$ 815	$ 7,703

Fair value of 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, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of 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, elected not to be offset against a right to receive collateral under a master netting arrangement.

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