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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, plant and equipment [Abstract]      
Total property, plant and equipment $ 280,184 $ 270,050  
Less accumulated depreciation 191,081 191,551  
Total property, plant and equipment, net 89,103 78,499  
Depreciation expense 15,400 12,800 $ 12,100
Land, Buildings and Improvements [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 46,930 46,447  
Machinery and Equipment [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 132,467 128,650  
Tools, Dies and Auxiliary Equipment [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 45,769 44,683  
Furniture and Fixtures [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 28,352 27,482  
Leasehold Improvements [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment 10,348 8,369  
Construction-in-Progress [Member]      
Property, plant and equipment [Abstract]      
Total property, plant and equipment $ 16,318 $ 14,419