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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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Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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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)
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
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