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Debt - Disclosure of recognition of debt arising from financing activities (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 01, 2020
Aug. 31, 2020
Mar. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt arising from financing activities [Roll Forward]                
Balance beginning of year             $ 479,732,000  
Financing cash flows related to debt:                
Repayment of borrowings             (132,714,000) $ (600,000,000)
Proceeds from borrowings, classified as financing activities             150,000,000 494,000,000
Loan financing costs             0 (15,583,000)
Non-cash changes recorded in debt:                
Amortization of discount and transaction costs of senior secured notes due to early redemption             2,286,000 0
Balance end of year       $ 501,132,000     501,132,000 479,732,000
Senior notes due 2024 and term loan                
Debt arising from financing activities [Roll Forward]                
Balance beginning of year             479,732,000 0
Financing cash flows related to debt:                
Loan financing costs               (15,583,000)
Total financing cash flows related to debt             (132,714,000) 478,417,000
Borrowings, excluding non-cash charges       347,018,000     347,018,000 478,417,000
Non-cash changes recorded in debt:                
Amortization of discount and transaction costs of senior secured notes due to early redemption             2,286,000  
Amortization of financing fees and discount relating to Senior notes due 2024 and term loan             3,588,000 2,206,000
Prepaid credit facility financing costs               3,333,000
Balance end of year       351,132,000     351,132,000 479,732,000
Revolving credit facility                
Debt arising from financing activities [Roll Forward]                
Balance beginning of year             0  
Financing cash flows related to debt:                
Proceeds from borrowings, classified as financing activities     $ 150,000,000     $ 150,000,000 150,000,000  
Total financing cash flows related to debt             150,000,000  
Borrowings, excluding non-cash charges       150,000,000     150,000,000  
Non-cash changes recorded in debt:                
Balance end of year       150,000,000     150,000,000 0
Senior Secured Notes due 2024                
Debt arising from financing activities [Roll Forward]                
Balance beginning of year             287,568,000  
Financing cash flows related to debt:                
Repayment of borrowings $ (8,183,000) $ (65,530,000)         (66,047,000)  
Proceeds from borrowings, classified as financing activities               294,000,000
Non-cash changes recorded in debt:                
Change in fair value of redemption option derivative asset relating to Senior secured notes due 2024             (1,760,000) (4,224,000)
Balance end of year       226,647,000     226,647,000 287,568,000
Term loan                
Debt arising from financing activities [Roll Forward]                
Balance beginning of year             197,761,000  
Financing cash flows related to debt:                
Repayment of borrowings       (33,333,000) $ (33,333,000)   (66,667,000)  
Proceeds from borrowings, classified as financing activities               200,000,000
Non-cash changes recorded in debt:                
Balance end of year       $ 131,842,000     131,842,000 197,761,000
Senior notes due 2020                
Debt arising from financing activities [Roll Forward]                
Balance beginning of year             $ 0 595,977,000
Financing cash flows related to debt:                
Repayment of borrowings               (600,000,000)
Total financing cash flows related to debt               (600,000,000)
Borrowings, excluding non-cash charges               (4,023,000)
Non-cash changes recorded in debt:                
Amortization of deferred costs for Senior notes due 2020, and deferred costs expensed upon note redemption               4,023,000
Balance end of year               $ 0