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Derivatives - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 counterparty | Sep. 30, 2016 institution | Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure |  |  |  |  |  |  |  |  |
Cash received on settlement of derivative contracts |  | $ 17,900,000 |  | $ 72,608,000 | $ 278,581,000 |  |  |  |
Number of counterparties to open derivative contracts |  |  |  |  |  |  | 4 | 4 |
(Gain) loss on derivative contracts | $ (338,000) |  | $ (42,211,000) | $ 4,823,000 | (59,034,000) |  |  |  |
Senior Unsecured Notes | 8.75% Senior Notes due 2020 |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.75% |  |  | 8.75% |  |  |  |  | 8.75%
Aggregate outstanding principal amount |  |  |  |  |  | $ 100,000,000 |  |  |
Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |  |  |  |  |  |
(Gain) loss on derivative contracts | $ (300,000) |  | (42,200,000) | $ 4,800,000 | (59,000,000) |  |  |  |
Cash receipts, upon settlement of derivative contract | $ 14,600,000 |  | $ 67,300,000 | $ 72,600,000 | $ 278,600,000 |  |  |  |

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