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Goodwill
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
Six Months EndedYear Ended
June 30, 2020December 31, 2019
(in thousands)
Opening balance$883,170  $756,260  
Current period acquisitions (Note 6)27,304  126,932  
Prior period acquisitions123  —  
Foreign exchange movement(9,352) (22) 
Closing balance$901,245  $883,170