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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 393,843 $ 372,482
Less allowances for depreciation (323,110) (298,568)
Net property, plant and equipment 70,733 73,914
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 2,686 2,671
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 55,076 53,692
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 285,869 270,426
Dies and Tools [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 50,212 $ 45,693