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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure
6. Property, Plant and Equipment, net
 June 30, 2021December 31, 2020
Land$61,598 $60,287 
Buildings and improvements571,326 570,366 
Machinery, equipment and other1,797,637 1,772,772 
Property, plant and equipment, gross2,430,561 2,403,425 
Accumulated depreciation(1,535,010)(1,506,099)
Property, plant and equipment, net$895,551 $897,326 

Depreciation expense totaled $36,045 and $33,365 for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, depreciation expense was $74,239 and $67,920, respectively.