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Long-Term Debt (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
Debt Instrument
Long term debt, discount	$ 3,649	$ 4,598
7.5% Senior Notes due 2021
Debt Instrument
Long term debt, premium	2,652	3,486
7.5% Senior Notes due 2023
Debt Instrument
Long term debt, discount	$ 2,436	$ 3,452
8.125% Convertible Senior Notes due 2022, including holder conversion feature liabilities of $3,113, and net of $105,691 discount
Debt Instrument
Long-term debt, fixed interest rate	8.125%
7.5% Convertible Senior Notes due 2023, including holder conversion feature liabilities of $2,361, and net of $87,412 discount
Debt Instrument
Long-term debt, fixed interest rate	7.50%
Senior Secured Notes
Debt Instrument
Long-term debt, fixed interest rate	8.75%
Senior Secured Notes | 8.75% Senior Secured Notes due 2020
Debt Instrument
Debt maturity date	2020
Long-term debt, fixed interest rate	8.75%
Senior Notes | 8.75% Senior Notes due 2020
Debt Instrument
Debt maturity date	2020	2020
Long-term debt, fixed interest rate	8.75%	8.75%
Long term debt, discount	$ 3,649	$ 4,598
Senior Notes | 7.5% Senior Notes due 2021
Debt Instrument
Debt maturity date	2021	2021
Long-term debt, fixed interest rate	7.50%	7.50%
Long term debt, premium	$ 2,652	$ 3,486
Senior Notes | 8.125% Senior Notes due 2022
Debt Instrument
Debt maturity date	2022	2022
Long-term debt, fixed interest rate	8.125%	8.125%
Senior Notes | 7.5% Senior Notes due 2023
Debt Instrument
Debt maturity date	2023	2023
Long-term debt, fixed interest rate	7.50%	7.50%
Long term debt, discount	$ 2,436	$ 3,452
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022, including holder conversion feature liabilities of $3,113, and net of $105,691 discount
Debt Instrument
Debt maturity date	2022
Long-term debt, fixed interest rate	8.125%		8.125%
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, including holder conversion feature liabilities of $2,361, and net of $87,412 discount
Debt Instrument
Debt maturity date	2023
Long-term debt, fixed interest rate	7.50%		7.50%
Long term debt, discount	$ 87,412
Fair value of holder conversion feature liability	$ 2,361

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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