Goodwill and other intangible assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 541,480	$ 539,818	$ 501,145
Goodwill acquired	311,203	1,662	38,673
Measurement period adjustments	(477)	0	0
Foreign currency translation adjustment	(6,472)	0	0
Goodwill, end of period	$ 845,734	$ 541,480	$ 539,818