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Intangible assets and goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill beginning of the period $ 1,031,696 $ 954,282
Business acquisitions 167,209 76,313
Foreign exchange 9,485 1,101
Goodwill end of the period $ 1,208,390 $ 1,031,696