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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Aug. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis
Carrying Value	$ 3,981,371	$ 3,562,378
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 due 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis
Carrying Value	$ 1,267,924	$ 1,265,814
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	$ 389,645	$ 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	$ 751,416	$ 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	$ 519,026	$ 518,693
Long-term debt, fixed interest rate	8.125%	8.125%
Senior Unsecured Notes | 7.5% Senior Notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis
Carrying Value	$ 535,191	$ 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 Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis
Carrying Value	$ 14,692	$ 78,290
Long-term debt, fixed interest rate	8.125%	8.125%	8.125%
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis
Carrying Value	$ 14,577	$ 24,393
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%
Fair Value Measurements Level 2 | Senior Secured Notes | 8.75% Senior Secured Notes due 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair Value	$ 332,930	$ 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	24,769	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	43,386	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	31,610	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	27,129	58,799
Fair Value Measurements Level 2 | Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair Value	103	44,199
Fair Value Measurements Level 2 | Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair Value	$ 118	$ 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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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 942
-SubTopic 210
-Section S99
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-Publisher SEC
-Name Regulation S-X (SX)
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