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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Components of Property, Plant and Equipment    
Property and equipment $ 106,146 $ 107,414
Less accumulated depreciation (41,052) (38,579)
Property and equipment, net 65,094 68,835
Land    
Components of Property, Plant and Equipment    
Property and equipment 6,642 6,104
Buildings and leasehold improvements    
Components of Property, Plant and Equipment    
Property and equipment 43,030 42,064
Machinery and equipment    
Components of Property, Plant and Equipment    
Property and equipment 40,923 38,913
Fixed assets in progress    
Components of Property, Plant and Equipment    
Property and equipment 2,320 4,297
Furniture and fixtures    
Components of Property, Plant and Equipment    
Property and equipment 1,718 1,994
Transportation equipment    
Components of Property, Plant and Equipment    
Property and equipment 2,001 1,877
Computer equipment and software    
Components of Property, Plant and Equipment    
Property and equipment $ 9,512 $ 12,165