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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 536,080 $ 531,832
Less: accumulated depreciation (379,981) (373,892)
Net property, plant and equipment 156,099 157,940
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,020 3,188
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 119,051 117,910
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 387,758 386,690
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 26,251 $ 24,044