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Other comprehensive income (loss) and accumulated other comprehensive items - (Tables) | 12 Months Ended
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Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Summary of other comprehensive income (loss) and the changes in accumulated other comprehensive items | The following table summarizes other comprehensive (loss) income and the changes in accumulated other comprehensive items, by component, for the years ended December 31, 2023, 2022, and 2021, respectively. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized |  | ​ | ​ |  | Total
​ | ​ | Gains (Losses) | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | On | ​ | Foreign | ​ | Other
​ | ​ | Marketable | ​ | Currency | ​ | Comprehensive
​ | ​ | Securities, net of tax | ​ | Translation | ​ | Items
Balance at December 31, 2020 | ​ | $ | 1,900 | ​ | $ | (62,857) | ​ | $ | (60,957)
Other comprehensive (loss) income before reclassifications | ​ |  | (3,279) | ​ |  | 39,177 | ​ |  | 35,898
Amounts reclassified from other comprehensive items | ​ |  | 777 | ​ |  | — | ​ |  | 777
Other comprehensive (loss) income | ​ |  | (2,502) | ​ |  | 39,177 | ​ |  | 36,675
Balance at December 31, 2021 | ​ | $ | (602) | ​ | $ | (23,680) | ​ | $ | (24,282)
Other comprehensive income before reclassifications | ​ |  | 4,072 | ​ |  | 28,970 | ​ |  | 33,042
Amounts reclassified from other comprehensive items | ​ |  | (3,964) | ​ |  | — | ​ |  | (3,964)
Other comprehensive income | ​ |  | 108 | ​ |  | 28,970 | ​ |  | 29,078
Balance at December 31, 2022 | ​ | $ | (494) | ​ | $ | 5,290 | ​ | $ | 4,796
Other comprehensive income (loss) before reclassifications | ​ |  | 1,135 | ​ | ​ | (6,901) | ​ | ​ | (5,766)
Amounts reclassified from other comprehensive items | ​ |  | (315) | ​ | ​ | — | ​ | ​ | (315)
Other comprehensive income (loss) | ​ |  | 820 | ​ |  | (6,901) | ​ |  | (6,081)
Balance at December 31, 2023 | ​ | $ | 326 | ​ | $ | (1,611) | ​ | $ | (1,285)

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