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Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant & Equipment:      
Depreciation expense $ 8,187,000 $ 7,361,000 $ 6,190,000
Asset Impairment Charges $ 0 $ 0 $ 0
Land improvements      
Property, Plant & Equipment:      
Useful life 20 years    
Buildings and improvements | Minimum [Member]      
Property, Plant & Equipment:      
Useful life 20 years    
Buildings and improvements | Maximum [Member]      
Property, Plant & Equipment:      
Useful life 40 years    
Machinery and equipment | Minimum [Member]      
Property, Plant & Equipment:      
Useful life 3 years    
Machinery and equipment | Maximum [Member]      
Property, Plant & Equipment:      
Useful life 15 years    
Tools, dies and patterns | Minimum [Member]      
Property, Plant & Equipment:      
Useful life 3 years    
Tools, dies and patterns | Maximum [Member]      
Property, Plant & Equipment:      
Useful life 5 years