Summary of significant accounting policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Total property, plant and equipment	$ 751,884	$ 952,301
Accumulated depreciation	(336,500)	(362,029)
Net property, plant and equipment	415,384	590,272
Land
Property, Plant and Equipment
Total property, plant and equipment	48,389	74,549
Buildings and improvements
Property, Plant and Equipment
Total property, plant and equipment	$ 239,414	348,591
Buildings and improvements | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	30 years
Machinery and equipment
Property, Plant and Equipment
Total property, plant and equipment	$ 352,372	426,348
Machinery and equipment | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	20 years
Furniture, fixtures and computer software
Property, Plant and Equipment
Total property, plant and equipment	$ 101,571	96,739
Furniture, fixtures and computer software | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	3 years
Furniture, fixtures and computer software | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	10 years
Construction in progress
Property, Plant and Equipment
Total property, plant and equipment	$ 10,138	$ 6,074
Internal use software | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	3 years
Internal use software | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	5 years