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Long-term debt - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 10, 2024 | Nov. 23, 2020 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 19, 2024 | Dec. 31, 2023 | Sep. 22, 2020
5.50% Senior Secured Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 113,050,000 |  | $ 113,050,000 |  |  | $ 113,050,000 |
Interest expense |  |  | $ 1,600,000 | $ 1,600,000 | $ 4,700,000 | $ 4,700,000 |  |  |
5.50% Senior Secured Notes | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  |  |  |  |  |  | $ 125,000,000
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.50%
Issue price (as a percent) |  |  |  |  |  |  |  |  | 100.00%
Long-term debt, gross |  |  |  | $ 113,050,000.00 |  | $ 113,050,000.00 | $ 113,050,000.00 |  |
Redemption price (as a percent) |  | 99.80% |  |  |  |  |  |  |
5.50% Senior Secured Notes | Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 113,050,000.00 |  |  |  |  |  |  |  |
Redemption price (as a percent) | 100.00% |  |  |  |  |  |  |  |
6.75% Senior Secured Notes | Secured Debt |  |  |  |  |  |  |  |  |
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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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