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Restructuring and integration expense (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | $ 15,212 | $ 18,483
Total cost of revenue [Member] |  |
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | 899 | 829
Operating expenses [Member] |  |
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | 14,313 | 17,654
External consulting fees [Member] |  |
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | 7,383 | 10,901
Internal labor [Member] |  |
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | 2,041 | 1,853
Employee severance benefits [Member] |  |
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | 1,877 |
Restructuring charges, net | 857 | 5,083
Other [Member] |  |
Restructuring and integration expense [Line Items] |  |
Restructuring and integration expense | $ 4,931 | $ 646

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