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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

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