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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Cost $ 2,430,561   $ 2,430,561   $ 2,403,425
Accumulated depreciation (1,535,010)   (1,535,010)   (1,506,099)
Total 895,551   895,551   897,326
Depreciation expense 36,045 $ 33,365 74,239 $ 67,920  
Land [Member]          
Property, Plant and Equipment [Line Items]          
Cost 61,598   61,598   60,287
Buildings and improvements [Member]          
Property, Plant and Equipment [Line Items]          
Cost 571,326   571,326   570,366
Machinery, equipment and other [Member]          
Property, Plant and Equipment [Line Items]          
Cost $ 1,797,637   $ 1,797,637   $ 1,772,772