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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment      
Property, Plant and Equipment $ (298,500) $ (276,811)  
Accumulated Depreciation, Property, Plant and Equipment prior to Assets Held for Sale 186,403 183,849  
Accumulated Depreciation (186,403) (181,853)  
Property, Plant and Equipment, Net 112,097 94,958  
Impairment loss recorded on fixed assets   622  
Depreciation expense 17,891 16,550 $ 17,694
Land      
Property, Plant and Equipment      
Property, Plant and Equipment (6,328) (4,232)  
Buildings and improvements      
Property, Plant and Equipment      
Property, Plant and Equipment (58,577) (52,118)  
Machinery and manufacturing equipment      
Property, Plant and Equipment      
Property, Plant and Equipment (116,221) (117,197)  
Office equipment      
Property, Plant and Equipment      
Property, Plant and Equipment (89,838) (80,972)  
Work in progress      
Property, Plant and Equipment      
Property, Plant and Equipment (27,536) (24,481)  
Gross Property, Plant and Equipment held for sale      
Property, Plant and Equipment      
Property, Plant and Equipment 0 (2,189)  
Accumulated Depreciation, reduction due to assets held for sale $ 0 $ 1,996