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Debt - 2023 Senior Notes (Details) - 2023 Senior Notes - USD ($)
9 Months Ended
Sep. 30, 2016
Aug. 17, 2015
Debt Instrument [Line Items]    
Interest rate (as a percent)   7.875%
Redemption price as a percentage of principal 107.875%  
Repurchase price as a percentage of principal amount of notes plus accrued and unpaid interest 100.00%  
Carrying value, net $ 489,300,000  
Maximum    
Debt Instrument [Line Items]    
Percentage of principal amount of redeemable debt 35.00%  
Minimum    
Debt Instrument [Line Items]    
Percentage of principal amount of outstanding debt 65.00%  
Percentage of aggregate principal that must be held to accelerate amounts due 25.00%  
Change Of Control    
Debt Instrument [Line Items]    
Repurchase price as a percentage of principal amount of notes plus accrued and unpaid interest 101.00%  
CBR | Private Placement    
Debt Instrument [Line Items]    
Aggregate principal amount of debt issued $ 500,000,000