Restructuring and integration expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 13,894	$ 18,923	$ 41,085	$ 57,788
Total cost of revenue [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	1,559	(26)	3,073	831
Operating expenses [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	12,335	18,949	38,012	56,957
External consulting fees [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	6,432	14,898	19,355	37,136
Internal labor [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	1,756	2,218	6,276	5,200
Employee severance benefits [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			4,690
Restructuring charges, net	1,293	752	3,167	10,870
Other [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 4,413	$ 1,055	$ 12,287	$ 4,582