Restructuring and integration expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 11,979	$ 20,382	$ 27,191	$ 38,865
Total cost of revenue [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	615	28	1,514	857
Operating expenses [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	11,364	20,354	25,677	38,008
External consulting fees [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	5,540	11,337	12,923	22,238
Internal labor [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	2,480	1,128	4,520	2,981
Employee severance benefits [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			3,127
Restructuring charges, net	1,018	5,035	1,875	10,118
Other [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 2,941	$ 2,882	$ 7,873	$ 3,528