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Summary of Significant Accounting Policies (Property Plant and Equipment Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 393,541 $ 375,159
Less: accumulated depreciation (281,328) (264,757)
Property, Plant and Equipment, Net, Total 112,213 110,402
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 4,619 4,863
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 37,234 37,581
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 212,225 192,107
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 9,929 10,070
Tooling [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 75,620 75,038
Information Technology [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 27,179 27,466
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 872 881
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 2,799 2,841
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 23,064 $ 24,312