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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment consisted of the following (in thousands):
 December 31,
 20202019
Machinery, equipment and vehicles$14,999 $17,170 
Furniture and fixtures3,142 3,530 
Leasehold improvements2,290 2,725 
Buildings334 321 
 20,765 23,746 
Accumulated depreciation and amortization(16,115)(17,943)
 $4,650 $5,803 
 
Depreciation expense was $2.3 million, $2.4 million and $2.2 million for the years ended December 31, 2020, 2019 and 2018, respectively.