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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) |
Summary of activity for changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | Total Accumulated Other
​ | ​ | Currency (1) | ​ | Comprehensive Loss
Accumulated other comprehensive loss, balance at December 31, 2020 | ​ | $ | (2,155) | ​ | $ | (2,155)
Change in accumulated other comprehensive loss | ​ | ​ | (4,143) | ​ | ​ | (4,143)
Accumulated other comprehensive loss, balance at March 31, 2021 | ​ | $ | (6,298) | ​ | $ | (6,298)
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | Total Accumulated Other
​ | ​ | Currency (1) | ​ | Comprehensive Income (Loss)
Accumulated other comprehensive income, balance at December 31, 2019 | ​ | $ | 4,890 | ​ | $ | 4,890
Change in accumulated other comprehensive loss | ​ | ​ | (30,646) | ​ | ​ | (30,646)
Accumulated other comprehensive loss, balance at March 31, 2020 | ​ | $ | (25,756) | ​ | $ | (25,756)
(1) | Foreign currency translation 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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