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Long-Term Debt (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2015	Aug. 31, 2015	Jun. 30, 2015
8.125% Convertible Senior Notes due 2022, including holder conversion feature liabilities of $21,874, and net of $180,751 discount
Debt Instrument [Line Items]
Long-term debt, fixed interest rate	8.125%
7.5% Convertible Senior Notes due 2023, including holder conversion feature liabilities of $7,481, and net of $59,549 discount
Debt Instrument [Line Items]
Long-term debt, fixed interest rate	7.50%
Secured Debt | 8.75% Senior Secured Notes Due 2020
Debt Instrument [Line Items]
Debt maturity date	2020
Long-term debt, fixed interest rate	8.75%				8.75%
Long term debt, discount	$ 29,842		$ 30,500
Embedded derivative, fair value	$ 2,941		$ 2,800
Senior Notes | 8.75% Senior Notes due 2020, net of $3,269 and $4,598 discount, respectively
Debt Instrument [Line Items]
Debt maturity date	2020	2020
Long-term debt, fixed interest rate	8.75%	8.75%	8.75%	8.75%
Long term debt, discount	$ 3,269	$ 4,598
Senior Notes | 7.5% Senior Notes due 2021, including a premium of $1,944 and $3,486, respectively
Debt Instrument [Line Items]
Debt maturity date	2021	2021
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%	7.50%
Long term debt, premium	$ 1,944	$ 3,486
Senior Notes | 8.125% Senior Notes due 2022
Debt Instrument [Line Items]
Debt maturity date	2022	2022
Long-term debt, fixed interest rate	8.125%	8.125%	8.125%	8.125%
Senior Notes | 7.5% Senior Notes due 2023, net of $1,989 and $3,452 discount, respectively
Debt Instrument [Line Items]
Debt maturity date	2023	2023
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%	7.50%
Long term debt, discount	$ 1,989	$ 3,452
Convertible Debt | 8.125% Convertible Senior Notes due 2022, including holder conversion feature liabilities of $21,874, and net of $180,751 discount
Debt Instrument [Line Items]
Debt maturity date	2022	2022
Long-term debt, fixed interest rate	8.125%	8.125%	8.125%	8.125%
Long term debt, discount	$ 180,751
Embedded derivative, fair value	$ 21,874
Convertible Debt | 7.5% Convertible Senior Notes due 2023, including holder conversion feature liabilities of $7,481, and net of $59,549 discount
Debt Instrument [Line Items]
Debt maturity date	2023	2023
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%	7.50%
Long term debt, discount	$ 59,549
Embedded derivative, fair value	$ 7,481

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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