Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property plant and equipment
Gross property, plant and equipment	$ 1,598,309	$ 1,558,915
Less accumulated depreciation	(1,037,225)	(964,089)
Net property, plant and equipment	561,084	594,826
Land
Property plant and equipment
Gross property, plant and equipment	52,424	50,129
Buildings
Property plant and equipment
Gross property, plant and equipment	299,560	279,901
Building and leasehold improvements
Property plant and equipment
Gross property, plant and equipment	153,333	155,917
Machinery and equipment
Property plant and equipment
Gross property, plant and equipment	927,075	875,581
Furniture and fixtures
Property plant and equipment
Gross property, plant and equipment	144,667	133,573
Construction in progress
Property plant and equipment
Gross property, plant and equipment	$ 21,250	$ 63,814