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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.125%
7.5% Convertible Senior Notes due 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	7.50%
Secured Debt | 8.75% Senior Secured Notes Due 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.75%				8.75%
Debt maturity date	2020
Embedded derivative, fair value	$ 2,941		$ 2,800
Long term debt, discount	$ 29,842		$ 30,500
Senior Notes | 8.75% Senior Notes due 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.75%	8.75%	8.75%	8.75%
Debt maturity date	2020	2020
Long term debt, discount	$ 3,269	$ 4,598
Senior Notes | 7.5% Senior Notes due 2021
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%	7.50%
Debt maturity date	2021	2021
Long term debt, premium	$ 1,944	$ 3,486
Senior Notes | 8.125% Senior Notes due 2022
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.125%	8.125%	8.125%	8.125%
Debt maturity date	2022	2022
Senior Notes | 7.5% Senior Notes due 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%	7.50%
Debt maturity date	2023	2023
Long term debt, discount	$ 1,989	$ 3,452
Convertible Debt | 8.125% Convertible Senior Notes due 2022
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.125%	8.125%	8.125%	8.125%
Debt maturity date	2022	2022
Embedded derivative, fair value	$ 21,874
Long term debt, discount	$ 180,751
Convertible Debt | 7.5% Convertible Senior Notes due 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	7.50%	7.50%	7.50%	7.50%
Debt maturity date	2023	2023
Embedded derivative, fair value	$ 7,481
Long term debt, discount	$ 59,549

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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-Topic 210
-SubTopic 10
-Section S99
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