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Restructuring and integration expense (accruals) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Charges $ 15,212 $ 18,483
Employee severance benefits [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance, December 31, 2020 6,798  
Charges 1,877  
Reversals (1,020)  
Payments (5,701)  
Balance, March 31, 2021 $ 1,954