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Summary of Significant Accounting Policies (Property Plant and Equipment Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 375,159 $ 334,132
Less: accumulated depreciation (264,757) (242,632)
Property, Plant and Equipment, Net, Total 110,402 91,500
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 4,863 3,376
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 37,581 32,271
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 192,107 180,944
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 10,070 6,813
Tooling [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 75,038 67,261
Information Technology [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 27,466 23,632
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 881 398
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 2,841 2,583
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 24,312 $ 16,854