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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2024
Accumulated Other Comprehensive Income |
Summary of changes in accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gain (Loss) on | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Marketable | ​ | Foreign | ​ | ​ | ​
​ |  | Securities |  | Currency Items |  | Total
​ | ​ | (In thousands)
Balance at December 31, 2023 | ​ | $ | 712 | ​ | $ | 2,596 | ​ | $ | 3,308
Other comprehensive loss | ​ |  | (1,064) | ​ |  | — | ​ |  | (1,064)
Balance at March 31, 2024 | ​ | $ | (352) | ​ | $ | 2,596 | ​ | $ | 2,244

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