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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
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 Secured Notes | 8.75% Senior Secured Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 1,328,000 | $ 1,265,814 |
Long-term debt, fixed interest rate | 8.75% |  |
Senior Unsecured Notes | 8.75% Senior Secured Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Long-term debt, fixed interest rate | 8.75% | 8.75% |
Senior Unsecured Notes | 8.75% Senior Notes due 2020 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 395,935 | $ 389,232 |
Long-term debt, fixed interest rate | 8.75% | 8.75% |
Senior Unsecured Notes | 7.5% Senior Notes due 2021 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 757,767 | $ 751,087 |
Long-term debt, fixed interest rate | 7.50% | 7.50% |
Senior Unsecured Notes | 8.125% Senior Notes due 2022 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 527,737 | $ 518,693 |
Long-term debt, fixed interest rate | 8.125% | 8.125% | 8.125%
Senior Unsecured Notes | 7.5% Senior Notes due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 543,561 | $ 534,869 |
Long-term debt, fixed interest rate | 7.50% | 7.50% |
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% |
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% |
Convertible Debt | 8.125% Convertible Senior Notes due 2022 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 40,694 | $ 78,290 |
Long-term debt, fixed interest rate | 8.125% |  | 8.125%
Convertible Debt | 7.5% Convertible Senior Notes due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Carrying value | $ 46,900 | 24,393 |
Long-term debt, fixed interest rate | 7.50% |  | 7.50%
Fair Value Measurements Level 2 | Senior Secured Notes | 8.75% Senior Secured Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | $ 487,207 | 403,098 |
Fair Value Measurements Level 2 | Senior Unsecured Notes | 8.75% Senior Notes due 2020 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | 28,579 | 39,740 |
Fair Value Measurements Level 2 | Senior Unsecured Notes | 7.5% Senior Notes due 2021 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | 47,019 | 79,812 |
Fair Value Measurements Level 2 | Senior Unsecured Notes | 8.125% Senior Notes due 2022 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | 30,047 | 57,749 |
Fair Value Measurements Level 2 | Senior Unsecured Notes | 7.5% Senior Notes due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | 34,589 | 58,799 |
Fair Value Measurements Level 2 | Convertible Debt | 8.125% Convertible Senior Notes due 2022 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | 2,339 | 44,199 |
Fair Value Measurements Level 2 | Convertible Debt | 7.5% Convertible Senior Notes due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair Value | $ 28 | $ 15,125 |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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