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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Rental expense $ 8,700 $ 6,500 $ 6,000
Capital Lease Obligations Incurred 200 800  
Property, Plant and Equipment [Line Items]      
Capitalized Computer Software, Gross 47,800 45,300  
Property, plant and equipment, gross 332,335 323,305  
Less: Accumulated depreciation (219,090) (207,076)  
Total property, plant and equipment 113,245 116,229  
Capitalized Computer Software, Accumulated Amortization (34,500) (30,400)  
Capitalized Computer Software, Amortization 4,700 4,500 $ 4,000
Operating Leases      
2019 8,759    
2020 5,520    
2021 2,929    
2022 2,406    
2023 1,563    
Thereafter 1,497    
Capital Leases      
2019 347    
2020 217    
2021 21    
2022 75    
2023 0    
Thereafter 0    
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 4,027 4,027  
Building and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 92,470 91,766  
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 227,795 219,675  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 8,043 $ 7,837