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Property and Equipment (Components of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components of Property, Plant and Equipment    
Property and equipment $ 77,334 $ 82,462
Less accumulated depreciation (37,505) (36,977)
Property and equipment, net 39,829 45,485
Land    
Components of Property, Plant and Equipment    
Property and equipment 4,440 4,372
Buildings and leasehold improvements    
Components of Property, Plant and Equipment    
Property and equipment 38,741 37,719
Machinery and equipment    
Components of Property, Plant and Equipment    
Property and equipment 27,694 26,995
Fixed assets in progress    
Components of Property, Plant and Equipment    
Property and equipment 0 581
Furniture and fixtures    
Components of Property, Plant and Equipment    
Property and equipment 1,671 1,573
Transportation equipment    
Components of Property, Plant and Equipment    
Property and equipment 1,440 1,852
Computer equipment and software    
Components of Property, Plant and Equipment    
Property and equipment $ 3,348 $ 9,370