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Debt - Senior Secured Notes due 2026 (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 15, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2023
Line of Credit Facility |  |  |  |  |  |  |
Principal balance |  | $ 1,061,400,000 |  | $ 1,061,400,000 |  |  | $ 1,130,600,000
Gain on early extinguishment of debt |  | (176,000) | $ 2,717,000 | 354,000 | $ 3,213,000 |  |
2026 Senior Notes | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Principal balance | $ 400,000,000 | 278,500,000 |  | 278,500,000 |  |  | 291,600,000
Stated interest rate (as a percent) | 6.00% |  |  |  |  |  |
Mandatory and optional prepayments |  |  |  | 13,000,000.0 |  |  |
Gain on early extinguishment of debt |  |  | 3,300,000 | 600,000 | 4,200,000 |  |
Interest expense |  | 4,100,000 | 4,900,000 | 12,700,000 | 15,000,000.0 |  |
Interest paid |  |  | 600,000 | 8,700,000 | 10,900,000 |  |
Amortization of the discount |  | 500,000 | 600,000 | 1,500,000 | 1,800,000 |  |
Amortization of debt issuance costs |  | $ 400,000 | 400,000 | $ 1,200,000 | 1,400,000 |  |
Effective interest rate (as a percent) |  | 7.30% |  | 7.30% |  |  |
2026 Senior Notes | Senior Notes | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt fair value |  | $ 277,800,000 |  | $ 277,800,000 |  |  | 256,600,000
2026 Senior Notes | Senior Notes | Period 1 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Redemption rate | 101.00% |  |  |  |  |  |
2026 Senior Notes | Senior Secured Term Loan |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 30,000,000.0 |
Extinguishment of debt, amount |  |  |  |  |  | $ 30,000,000.0 |
Senior Secured Term Loan | Senior Secured Term Loan |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Principal balance | $ 516,000,000.0 | 297,600,000 |  | 297,600,000 |  |  | $ 350,400,000
Debt instrument, reduction of quarterly amortization payment, waiver |  |  |  | 12,000,000.0 |  |  |
Gain on early extinguishment of debt |  | (200,000) | (600,000) | (300,000) | (1,000,000.0) |  |
Interest expense |  | 8,600,000 | 9,900,000 | 26,900,000 | 30,600,000 |  |
Amortization of the discount |  | 600,000 | 700,000 | 1,700,000 | 2,200,000 |  |
Amortization of debt issuance costs |  | $ 200,000 | $ 200,000 | $ 400,000 | $ 500,000 |  |
Effective interest rate (as a percent) |  | 11.20% |  | 11.20% |  |  |

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