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Condensed Consolidating Financial Information (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Condensed Financial Statements, Captions [Line Items]  
Subsidiary guarantors, percentage ownership 100.00%
7.75% Senior Secured Notes Due 2021 [Member] | Secured Debt [Member]  
Condensed Financial Statements, Captions [Line Items]  
Principal amount $ 600,000
Interest rate 7.75%
Covenant, Indenture Threshold for Earnings for Payment of Dividends $ 75,000
Covenant, Leverage Ratio Requirement 3.0
Covenant, Secured Leverage Ratio Requirement 1.5