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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Additional Information) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Aug. 31, 2015
8.75% Senior Notes due 2020 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, discount | $ 3,649 | $ 4,598 |
7.5% Senior Notes due 2021 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long term debt, premium | 2,652 | 3,486 |
7.5% Senior Notes due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, discount | $ 2,436 | $ 3,452 |
8.125% Convertible Senior Notes due 2022 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, fixed interest rate | 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% |  |
Senior Notes | 8.75% Senior Notes due 2020 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, fixed interest rate | 8.75% | 8.75% |
Debt maturity date | 2020 | 2020 |
Long-term debt, discount | $ 3,649 | $ 4,598 |
Senior Notes | 7.5% Senior Notes due 2021 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, fixed interest rate | 7.50% | 7.50% |
Debt maturity date | 2021 | 2021 |
Long term debt, premium | $ 2,652 | $ 3,486 |
Senior Notes | 8.125% Senior Notes due 2022 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, fixed interest rate | 8.125% | 8.125% |
Debt maturity date | 2022 | 2022 |
Senior Notes | 7.5% Senior Notes due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, fixed interest rate | 7.50% | 7.50% |
Debt maturity date | 2023 | 2023 |
Long-term debt, discount | $ 2,436 | $ 3,452 |
Convertible Senior Unsecured Notes | 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%
Debt maturity date | 2022 |  |
Long-term debt, discount | $ 105,691 |  |
Fair value of holder conversion feature liability | $ 3,113 |  |
Convertible Senior Unsecured Notes | 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%
Debt maturity date | 2023 |  |
Long-term debt, discount | $ 87,412 |  |
Fair value of holder conversion feature liability | $ 2,361 |  |

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