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Long-term debt - Narrative (Details) - USD ($) |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2020 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 28, 2020 | Sep. 22, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs | $ 3,100,000 |  |  |  |  |
Debt issuance cost, amount paid to subsidiary | 1,900,000 |  |  |  |  |
Debt issuance costs capitalized | $ 1,200,000 |  |  |  |  |
5.50% Senior Secured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 113,050,000 | $ 113,050,000 |  |  |
Interest expense |  | 1,600,000 |  |  |  |
6.75% Senior Secured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
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 |
Senior Secured Notes | 5.50% Senior Secured 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%
Redemption price (as a percent) | 99.80% |  |  |  |  |
Interest rate during period (as a percent) | 5.50% |  |  |  |  |
Debt instrument, repurchase amount |  |  |  | $ 1,000,000 |  |
Notes outstanding |  | $ 113,050,000.00 |  |  |  |
Senior Secured Notes | 6.75% Senior Secured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 6.75%
Long-term debt, gross |  |  |  |  | $ 150,000,000 |

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