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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) |
Summary of activity for changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | Total Accumulated Other
​ | ​ | Currency (1) | ​ | Comprehensive Income (Loss)
Accumulated other comprehensive income, balance at December 31, 2018 | ​ | $ | — | ​ | $ | —
Change in accumulated other comprehensive income | ​ | ​ | 4,890 | ​ | ​ | 4,890
Accumulated other comprehensive income, balance at December 31, 2019 | ​ | $ | 4,890 | ​ | $ | 4,890
Change in accumulated other comprehensive loss | ​ | ​ | (7,045) | ​ | ​ | (7,045)
Accumulated other comprehensive loss, balance at December 31, 2020 | ​ | $ | (2,155) | ​ | $ | (2,155)
(1) | Foreign currency is not shown net of additional U.S. tax, as other basis differences of non-U.S. subsidiaries are intended to be permanently reinvested.

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