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Property, Plant, and Equipment and Assets Held for Sale - Property and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment, net      
Gross property, plant, and equipment $ 197,020 $ 159,505  
Less: accumulated depreciation and amortization 111,962 98,859  
Net property, plant, and equipment 85,058 60,646 $ 79,590
Depreciation expense 14,600 13,400 $ 12,200
Impairment charge of property, plant, and equipment   3,300  
Land      
Property, Plant and Equipment, net      
Gross property, plant, and equipment 5,669 5,669  
Building and improvements      
Property, Plant and Equipment, net      
Gross property, plant, and equipment 54,449 50,814  
Machinery and equipment      
Property, Plant and Equipment, net      
Gross property, plant, and equipment 126,829 99,370  
Leaseholds improvements      
Property, Plant and Equipment, net      
Gross property, plant, and equipment $ 10,073 $ 3,652