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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 520,119 $ 515,065
Less: accumulated depreciation (369,550) (358,051)
Net property, plant and equipment 150,569 157,014
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,218 3,312
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 117,877 119,970
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 384,146 379,747
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 14,878 $ 12,036