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Debt - 2023 Senior Notes (Details) - 2023 Senior Notes - USD ($)
12 Months Ended
Dec. 31, 2016
Aug. 17, 2015
Debt Instrument [Line Items]    
Interest rate (percent)   7.875%
Redemption price as a percentage of principal (percent) 107.875%  
Repurchase price as a percentage of principal amount of notes plus accrued and unpaid interest (percent) 100.00%  
Carrying value, net $ 489,600,000  
Maximum    
Debt Instrument [Line Items]    
Principal amount of redeemable debt (percent) 35.00%  
Minimum    
Debt Instrument [Line Items]    
Principal amount of outstanding debt (percent) 65.00%  
Aggregate principal that must be held to accelerate amounts due (percent) 25.00%  
Change Of Control    
Debt Instrument [Line Items]    
Repurchase price as a percentage of principal amount of notes plus accrued and unpaid interest (percent) 101.00%  
CBR    
Debt Instrument [Line Items]    
Principal amount of debt at time of issuance $ 500,000,000  
CBR | Private Placement    
Debt Instrument [Line Items]    
Principal amount of debt at time of issuance   $ 500,000,000.0