Restructuring and integration expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 18,483	$ 6,283
Total cost of revenue [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	829	791
Operating expenses [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	17,654	5,492
External consulting fees [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	10,901	2,146
Employee severance benefits [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	5,318
Restructuring charges, net	5,083	2,064
Internal labor [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	1,853	2,061
Other [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 646	$ 12