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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2015
Apr. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Loss on extinguishment of debt     $ 0 $ 633,000 $ 1,012,000
Senior Secured Notes | 5.375% senior secured notes due 2023          
Debt Instrument [Line Items]          
Face value of debt instruments at the time of issuance   $ 530,000,000      
Debt instrument interest rate percentage   5.375%      
Proceeds from issuance of debt, net   $ 522,000,000      
Senior Secured Notes | Senior Secured Notes Due 2023          
Debt Instrument [Line Items]          
Face value of debt instruments at the time of issuance $ 500,000,000        
Debt instrument interest rate percentage 5.25%        
Senior Secured Notes | 5.25% senior secured notes due 2023          
Debt Instrument [Line Items]          
Proceeds from issuance of debt, net $ 494,000,000