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Summary of Significant Accounting Policies (Property Plant and Equipment Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 402,841 $ 411,454
Less: accumulated depreciation (283,517) (288,971)
Property, Plant and Equipment, Net, Total 119,324 122,483
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 4,447 4,550
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 39,784 39,263
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 253,563 226,076
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 9,993 9,708
Tooling [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 40,967 76,933
Information Technology [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 28,491 32,410
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 654 614
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 5,198 4,588
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 19,744 $ 17,312