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Goodwill
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
Nine Months EndedYear Ended
September 30, 2020December 31, 2019
(in thousands)
Opening balance$883,170 $756,260 
Current period acquisitions (Note 6)27,191 126,932 
Prior period acquisitions123 — 
Foreign exchange movement3,929 (22)
Closing balance$914,413 $883,170