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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 499,591 $ 486,170
Less: accumulated depreciation (355,707) (337,492)
Net property, plant and equipment 143,884 148,678
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,744 2,684
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 114,127 111,762
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 375,033 361,010
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,687 $ 10,714