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Debt - 2023 Senior Notes (Details) - 2023 Senior Notes - USD ($)
3 Months Ended
Mar. 31, 2017
Aug. 17, 2015
Debt Instrument [Line Items]    
Interest rate (as a percent)   7.875%
Redemption price (as a percent) 107.875%  
Repurchase price of principal amount of notes plus accrued and unpaid interest (as a percent) 100.00%  
Carrying value, net $ 489,900,000  
Maximum    
Debt Instrument [Line Items]    
Principal amount of redeemable debt (as a percent) 35.00%  
Minimum    
Debt Instrument [Line Items]    
Principal amount of outstanding debt (as a percent) 65.00%  
Aggregate principal that must be held to accelerate amounts due (as a percent) 25.00%  
Change Of Control    
Debt Instrument [Line Items]    
Repurchase price of principal amount of notes plus accrued and unpaid interest (as a percent) 101.00%  
CBR    
Debt Instrument [Line Items]    
Aggregate principal amount of debt issued $ 500,000,000  
CBR | Private Placement    
Debt Instrument [Line Items]    
Aggregate principal amount of debt issued   $ 500,000,000