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Financial instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Financial instruments |
Schedule of Financial Instruments Not Carried at Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 | ​ | September 30, 2025
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair
​ |  | amount |  | value |  | amount |  | value
​ | ​ | (In thousands)
Cash, cash equivalents and restricted cash | ​ | $ | 184,190 | ​ | $ | 184,190 | ​ | $ | 123,570 | ​ | $ | 123,570

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