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Restructuring and integration expense (accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Charges	$ 11,979	$ 20,382	$ 27,191	$ 38,865
Employee severance benefits [Member]
Restructuring Cost and Reserve [Line Items]
Balance, December 31, 2020			6,798
Charges			3,127
Reversals			(1,252)
Payments			(6,193)
Balance, June 30, 2021	$ 2,480		$ 2,480