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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment, net, at December 31 consisted of:
 
20202019
Land$19,182 $17,644 
Buildings194,936 178,657 
Machinery and equipment696,260 644,339 
910,378 840,640 
Less accumulated depreciation(539,431)(484,037)
$370,947 $356,603 
Depreciation expense was $46,590, $47,552 and $48,914 during 2020, 2019 and 2018, respectively.