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Long-term debt - Narrative (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 10, 2024 | Nov. 23, 2020 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 19, 2024 | Sep. 22, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash paid during the year for interest |  |  | $ 88,795,000 | $ 68,399,000 | $ 22,810,000 |  |
5.50% Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross |  |  | 0 | 113,050,000 |  |  |
Interest expense, debt |  |  | 4,800,000 | 6,200,000 |  |  |
Cash paid during the year for interest |  |  | $ 4,800,000 | $ 6,200,000 |  |  |
5.50% Senior Secured Notes | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 5.50%
Aggregate principal amount of debt issued |  |  |  |  |  |  | $ 125,000,000
Issue price (as a percent) |  |  |  |  |  |  | 100.00%
Long-term debt gross | $ 113,050,000.00 |  |  |  |  | $ 113,050,000.00 |
Redemption price (as a percent) | 100.00% | 99.80% |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  | $ 11,950,000 |
6.75% Senior Secured Notes | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 6.75%
Long-term debt gross |  |  |  |  |  |  | $ 150,000,000
Long term debt held in treasury |  |  |  |  |  |  | 1,400,000
Long term debt outstanding, net of amount held in treasury |  |  |  |  |  |  | $ 148,600,000

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