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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangible assets |
Schedule of Goodwill | ​
​ | ​ | ​ | ​
Balance, December 31, 2018 |  | $ | 671,594
Additions | ​ |  | 93
Foreign exchange movement | ​ |  | 623
Balance, December 31, 2019 | ​ | $ | 672,310
Additions (Note 4) | ​ |  | 165,770
Foreign exchange movement | ​ |  | 2,530
Balance, December 31, 2020 | ​ | $ | 840,610

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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