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Condensed Consolidating Financial Information - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Jun. 23, 2017
Apr. 12, 2011
Condensed Financial Statements, Captions [Line Items]      
Interest owned by the holding company 100.00%    
Senior Secured Notes [Member] | 6.75% Senior Secured Notes [Member]      
Condensed Financial Statements, Captions [Line Items]      
Issuance of private placement, principal amount   $ 200,000,000.0  
Interest rate   6.75%  
Senior Secured Notes [Member] | 8.75% Senior Secured Notes [Member]      
Condensed Financial Statements, Captions [Line Items]      
Issuance of private placement, principal amount     $ 200,000,000.0
Interest rate     8.75%