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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Cost $ 2,455,447   $ 2,455,447   $ 2,403,425
Accumulated depreciation (1,549,179)   (1,549,179)   (1,506,099)
Total 906,268   906,268   897,326
Depreciation expense 36,913 $ 34,096 111,152 $ 102,016  
Land [Member]          
Property, Plant and Equipment [Line Items]          
Cost 61,433   61,433   60,287
Buildings and improvements [Member]          
Property, Plant and Equipment [Line Items]          
Cost 576,597   576,597   570,366
Machinery, equipment and other [Member]          
Property, Plant and Equipment [Line Items]          
Cost $ 1,817,417   $ 1,817,417   $ 1,772,772