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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Machinery, equipment and vehicles $ 14,999 $ 17,170
Furniture and fixtures 3,142 3,530
Leasehold improvements 2,290 2,725
Buildings 334 321
Property, Plant and Equipment, Gross, Total 20,765 23,746
Accumulated depreciation and amortization (16,115) (17,943)
Property, Plant and Equipment, Net, Total $ 4,650 $ 5,803