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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment Depreciation is calculated using the straight-line method over the following ranges of estimated useful service lives, in years:
Estimated Useful Service Lives
Buildings
20 – 40
Building and leasehold improvements
6 – 20
Machinery and equipment
2 – 10
Furniture and fixtures
2 – 10
Property, plant and equipment is as follows:
December 31,
(cost in thousands)20202019
Land$52,424 $50,129 
Buildings299,560 279,901 
Building and leasehold improvements153,333 155,917 
Machinery and equipment927,075 875,581 
Furniture and fixtures144,667 133,573 
Construction in progress21,250 63,814 
1,598,309 1,558,915 
Less accumulated depreciation(1,037,225)(964,089)
Net property, plant and equipment$561,084 $594,826