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v3.21.4

Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Information |
Disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Revenue: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
United States | ​ | $ | 292,107 | ​ | $ | 287,723 | ​ | $ | 274,391
International | ​ |  | 29,217 | ​ |  | 30,200 | ​ |  | 32,860
Total | ​ | $ | 321,324 | ​ | $ | 317,923 | ​ | $ | 307,251

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