Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, net consisted of the following at December 31:
(In thousands)20202019
Buildings and improvements$2,143 $1,830 
Machinery, equipment and vehicles17,774 15,052 
Office furniture and equipment, computers and software17,346 12,998 
Property, plant and equipment, gross37,263 29,880 
Less: accumulated depreciation and amortization(14,690)(11,036)
Property, plant and equipment, net$22,573 $18,844 
Depreciation expense of property, plant and equipment was $4.1 million, $3.4 million and $1.8 million in 2020, 2019, and 2018, respectively.