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Derivative Instruments (Narrative) (Details) (USD $)	12 Months Ended
Derivative Instruments (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Current long-term derivative instrument strategy	60 months
Derivative liability, fair value of derivative instrument in a net liability position	$ 10,135,000	$ 0
Gain (loss) on derivative instruments, net	$ (18,400,000)	$ 31,400,000	$ 48,400,000

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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