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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Additional Information) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
8.75% Senior Notes due 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, discount	$ 4,242	$ 4,598
7.5% Senior Notes due 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long term debt, premium	3,175	3,486
7.5% Senior Notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, discount	$ 3,294	$ 3,452
Senior Notes | 8.75% Senior Notes due 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	8.75%	8.75%
Debt maturity date	2020	2020
Long-term debt, discount	$ 4,242	$ 4,598
Senior Notes | 7.5% Senior Notes due 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	7.50%	7.50%
Debt maturity date	2021	2021
Long term debt, premium	$ 3,175	$ 3,486
Senior Notes | 8.125% Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	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
Long-term debt, fixed interest rate	7.50%	7.50%
Debt maturity date	2023	2023
Long-term debt, discount	$ 3,294	$ 3,452

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 45



-Paragraph 1A



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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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-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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-Subparagraph (SX 210.5-02.22(a)(1))



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