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Derivatives - Narrative (Details)	1 Months Ended			3 Months Ended								12 Months Ended
	Feb. 28, 2014 USD ($)	Apr. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) institution	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 31, 2015	Aug. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Gain) loss on derivative contracts				$ (14,000,000)	$ (42,200,000)	$ 33,000,000	$ (49,800,000)	$ (329,200,000)	$ (132,600,000)	$ 85,300,000	$ 42,500,000	$ (73,061,000)	$ (334,011,000)	$ 47,123,000
Number of counterparties to open derivative contracts | institution												8
Interest expense												$ 321,421,000	244,109,000	270,234,000
Commodity Derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Gain) loss on derivative contracts												(73,100,000)	(334,000,000)	47,100,000
Commodity Derivatives | Cash
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Gain) loss on derivative contracts												$ (327,700,000)	$ 32,300,000	(800,000)
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense														10,000
Interest rate swaps | Cash
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense														$ 2,400,000
Derivative Contracts Early Settlements | Commodity Derivatives | Cash
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Gain) loss on derivative contracts	$ 69,600,000		$ 29,600,000
Senior Floating Rate Notes due 2014 | Fixed To Floating Interest Rate Swap Through April 1st 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, maturity date		Apr. 01, 2013
Derivative liability, notional amount		$ 350,000,000.0
Derivative, fixed interest rate		6.69%
Senior Notes | 8.75% Senior Notes due 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term debt, fixed interest rate				8.75%				8.75%				8.75%	8.75%		8.75%	8.75%
Mandatory prepayment feature, threshold amount of outstanding principal amount of senior notes				$ 100,000,000								$ 100,000,000
Lenders Of Senior Credit Facility [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of counterparties to open derivative contracts | institution												3

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Debt Instrument, Aggregate Outstanding Principal Amount, Threshold Adjusting Maturity Date Of Secured Notes

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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Nominal or face amount used to calculate payments on the derivative liability.

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