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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Machinery, equipment and vehicles $ 17,170 $ 18,121
Furniture and fixtures 3,530 3,779
Leasehold improvements 2,725 2,369
Buildings 321 311
Property, Plant and Equipment, Gross, Total 23,746 24,580
Accumulated depreciation and amortization (17,943) (18,721)
Property, Plant and Equipment, Net, Total $ 5,803 $ 5,859