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Summary of Significant Accounting Policies (Property Plant and Equipment Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 322,757 $ 307,476
Less: accumulated depreciation (237,493) (222,165)
Property, Plant and Equipment, Net, Total 85,264 85,311
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 3,538 4,036
Building and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 32,904 34,517
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 160,721 154,204
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 6,541 6,247
Tooling [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 68,101 67,135
Information Technology [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 24,035 22,132
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 422 65
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment 2,581 2,207
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant, and equipment $ 23,914 $ 16,933