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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]      
Cost $ 2,397,512   $ 2,403,425
Accumulated depreciation (1,516,381)   (1,506,099)
Total 881,131   897,326
Depreciation expense 38,194 $ 34,555  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Cost 60,567   60,287
Buildings and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Cost 569,109   570,366
Machinery, equipment and other [Member]      
Property, Plant and Equipment [Line Items]      
Cost $ 1,767,836   $ 1,772,772