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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2021
Accumulated Other Comprehensive Income |
Schedule of changes in accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Foreign |  | Defined benefit |  | ​ | ​ |
​ | ​ | currency | ​ | pension plan | ​ | Total |
​ | ​ | (in thousands) |
Balance at December 31, 2020 | ​ | $ | 3,945 | ​ | $ | (510) | ​ | $ | 3,435 | ​
Other comprehensive loss and pension reclassification | ​ |  | (1,769) | ​ |  | 84 | ​ |  | (1,685) | ​
Balance at September 30, 2021 | ​ | $ | 2,176 | ​ | $ | (426) | ​ | $ | 1,750 | ​

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