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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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