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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation $ 140,008 $ 133,340 $ 138,712
Cost 2,403,425 2,232,129  
Accumulated depreciation (1,506,099) (1,389,811)  
Total 897,326 842,318  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Cost 60,287 56,583  
Buildings and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Cost 570,366 527,192  
Machinery, equipment and other [Member]      
Property, Plant and Equipment [Line Items]      
Cost $ 1,772,772 $ 1,648,354