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Debt - Disclosure of Recognition of Debt Arising From Financing Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 05, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt arising from financing activities [Roll Forward]      
Debt balance at January 1, 2019   $ 595,977  
Financing cash flows related to debt:      
Repayment of Senior notes due 2020   600,000 $ 0
Proceeds from borrowings, classified as financing activities   494,000 0
Loan financing costs   (15,583) 0
Non-cash changes recorded in debt:      
Debt balance at December 31, 2019   479,732 595,977
Senior notes due 2024 and term loan      
Debt arising from financing activities [Roll Forward]      
Debt balance at January 1, 2019   0  
Financing cash flows related to debt:      
Loan financing costs   (15,583)  
Total financing cash flows related to debt   478,417  
Borrowings, excluding non-cash charges   478,417  
Non-cash changes recorded in debt:      
Amortization of financing fees and discount relating to Senior notes due 2024 and Term loan   2,206  
Prepaid credit facility financing costs   3,333  
Debt balance at December 31, 2019   479,732 0
Senior Secured Notes due 2024      
Debt arising from financing activities [Roll Forward]      
Debt balance at January 1, 2019   0  
Financing cash flows related to debt:      
Proceeds from borrowings, classified as financing activities $ 287,100 294,000  
Non-cash changes recorded in debt:      
Change in fair value of redemption option derivative asset relating to Senior secured notes due 2024   (4,224)  
Debt balance at December 31, 2019   287,568 0
Term loan      
Debt arising from financing activities [Roll Forward]      
Debt balance at January 1, 2019   0  
Financing cash flows related to debt:      
Proceeds from borrowings, classified as financing activities   200,000  
Non-cash changes recorded in debt:      
Debt balance at December 31, 2019   197,761 0
Senior notes due 2020      
Debt arising from financing activities [Roll Forward]      
Debt balance at January 1, 2019   595,977  
Financing cash flows related to debt:      
Repayment of Senior notes due 2020   (600,000)  
Total financing cash flows related to debt   (600,000)  
Borrowings, excluding non-cash charges   (4,023)  
Non-cash changes recorded in debt:      
Amortization of deferred costs for Senior notes due 2020, and deferred costs expensed upon note redemption   4,023  
Debt balance at December 31, 2019   $ 0 $ 595,977