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Fair Value Measurements (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Fair Value Measurements
Fair value derivative instruments Level 3 to Level 2 Transfers Amount		$ 54,400,000
Fair value on a recurring basis \| Fair Value
Assets
Derivative instruments, at fair value	66,408,000	107,647,000
Liabilities
Derivative instruments, at fair value	58,116,000	29,651,000
Fair value on a recurring basis \| Quoted prices in active markets for identical assets (Level 1)
Assets
Derivative instruments, at fair value	123,000	240,000
Liabilities
Derivative instruments, at fair value		315,000
Fair value on a recurring basis \| Significant other observable inputs (Level 2)
Assets
Derivative instruments, at fair value	66,285,000	107,407,000
Liabilities
Derivative instruments, at fair value	$ 58,116,000	$ 29,336,000

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.

+ References+ Details