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Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Opening balance $ 936,257 $ 883,170
Current period acquisitions (Note 6) 0 27,191
Prior period acquisitions 0 123
Foreign exchange movement (2,870) 25,773
Closing balance $ 933,387 $ 936,257