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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 583,367 $ 551,463
Less: accumulated depreciation (405,303) (384,425)
Property, plant and equipment, net 178,064 167,038
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,184 4,194
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 126,600 125,223
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 412,013 397,287
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 40,570 $ 24,759