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Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure
6. Property, Plant and Equipment, net
 September 30, 2021December 31, 2020
Land$61,433 $60,287 
Buildings and improvements576,597 570,366 
Machinery, equipment and other1,817,417 1,772,772 
Property, plant and equipment, gross2,455,447 2,403,425 
Accumulated depreciation(1,549,179)(1,506,099)
Property, plant and equipment, net$906,268 $897,326 

Depreciation expense totaled $36,913 and $34,096 for the three months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021 and 2020, depreciation expense was $111,152 and $102,016, respectively.