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Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Total $ 531,832 $ 515,065  
Less accumulated depreciation (373,892) (358,051)  
Property, plant, and equipment, net 157,940 157,014 $ 148,678
Land      
Property, Plant and Equipment [Line Items]      
Total 3,188 3,312  
Buildings      
Property, Plant and Equipment [Line Items]      
Total 117,910 119,970  
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Total 386,690 379,747  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Total $ 24,044 $ 12,036