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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Oct. 31, 2015
8.75% Senior Secured Notes | Senior Secured Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Face amount of debt instrument |  | $ 1,250,000,000.0 |  | $ 1,250,000,000.0 |  | $ 78,000,000.0
Long-term debt, fixed interest rate | 8.75% |  | 8.75% |  |  |
8.75% Senior Secured Notes | Senior Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.75% |  | 8.75% |  | 8.75% |
8.75% Senior Notes due 2020 | Senior Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.75% |  | 8.75% |  | 8.75% |
Aggregate outstanding principal amount | $ 100,000,000 |  | $ 100,000,000 |  |  |
Write off of derivative holder conversion feature to reorganization items | $ 2,500,000 |  | $ 2,500,000 |  |  |
8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.125% |  | 8.125% |  |  |
8.125% Convertible Senior Notes due 2022 | Senior Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.125% |  | 8.125% |  | 8.125% |
8.125% Convertible Senior Notes due 2022 | Convertible Debt |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.125% | 8.125% | 8.125% | 8.125% |  |
7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 7.50% |  | 7.50% |  |  |
7.5% Convertible Senior Notes due 2023 | Senior Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 7.50% |  | 7.50% |  | 7.50% |
7.5% Convertible Senior Notes due 2023 | Convertible Debt |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Long-term debt, fixed interest rate | 7.50% | 7.50% | 7.50% | 7.50% |  |
Write off of derivative holder conversion feature to reorganization items |  |  | $ 7,281,000 |  |  |
Debt holder conversion feature |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |  |
Write off of derivative holder conversion feature to reorganization items |  | $ 0 | $ 7,281,000 | $ 0 |  |

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