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Condensed Consolidating Financial Information (Narrative) (Details) - 7.75% Senior Secured Notes Due 2021 [Member] - Senior Notes
6 Months Ended
Jun. 30, 2016
USD ($)
May 09, 2016
USD ($)
Condensed Financial Statements, Captions [Line Items]    
Principal amount $ 835,000,000 $ 235,000,000
Interest rate   7.75%
Indenture threshold for earnings for payment of dividends (less than) $ 75,000,000  
Leverage ratio requirement 3.0  
Secured leverage ratio requirement 1.5