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Fair Value Measurements - Narrative (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Oct. 31, 2015	Aug. 31, 2015	Jun. 30, 2015
8.75% Senior Secured Notes due 2020 | Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Debt, face amount	$ 1,300,000,000		$ 78,000,000		$ 1,250,000,000.0
Long-term debt, fixed interest rate	8.75%	8.75%
8.75% Senior Notes due 2020 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	8.75%	8.75%
Aggregate outstanding principal amount	$ 100,000,000
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% Convertible Senior Notes due 2022 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	8.125%	8.125%
8.125% Convertible Senior Notes due 2022 | Convertible Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	8.125%	8.125%		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%
7.5% Convertible Senior Notes due 2023 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	7.50%	7.50%
7.5% Convertible Senior Notes due 2023 | Convertible Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Long-term debt, fixed interest rate	7.50%	7.50%		7.50%

X

- Definition

Debt Instrument, Aggregate Outstanding Principal Amount, Threshold Adjusting Maturity Date Of Secured Notes

+ References

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- Definition

Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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