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Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended
Derivative Instruments (Narrative) (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 21,524,000		$ 10,135,000
Current Long-Term Derivative Instrument Strategy	60 months
Derivative, Gain (Loss) on Derivative, Net	(20,680,000)	(14,554,000)
Derivative Asset, Fair Value	$ 6,700,000		$ 9,300,000

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.

+ References+ Details

- 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