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Summary of Significant Accounting Policies (Property Plant and Equipment Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 334,132 $ 322,757
Less: accumulated depreciation (242,632) (237,493)
Property, Plant and Equipment, Net, Total 91,500 85,264
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 3,376 3,538
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 32,271 32,904
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 180,944 160,721
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 6,813 6,541
Tooling [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 67,261 68,101
Information Technology [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 23,632 24,035
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 398 422
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 2,583 2,581
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 16,854 $ 23,914