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Fair value (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value. |
Schedule of fair value and carrying value of senior notes | The following table sets forth the fair value and carrying value of the senior notes (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (Unaudited) | ​
​ | ​ | December 31, 2024 | ​ | September 30, 2025 | ​
​ |  | Fair |  | Carrying |  | Fair |  | Carrying | ​
​ | ​ | Value (1) | ​ | Value (2) | ​ | Value (1) | ​ | Value (2) | ​
2026 Notes | ​ | $ | 98,924 | ​ | ​ | 96,599 | ​ | ​ | — | ​ | ​ | — | ​
2029 Notes | ​ | ​ | 417,211 | ​ | ​ | 404,055 | ​ | ​ | 372,295 | ​ | ​ | 363,052 | ​
2030 Notes | ​ | ​ | 579,660 | ​ | ​ | 595,376 | ​ | ​ | 603,000 | ​ | ​ | 595,968 | ​
Total | ​ | $ | 1,095,795 | ​ | ​ | 1,096,030 | ​ | ​ | 975,295 | ​ | ​ | 959,020 | ​
(1) | Fair values are based on Level 2 market data inputs.
(2) | Carrying values are presented net of unamortized debt issuance costs.

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