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PROPERTY AND EQUIPMENT
 12 Months Ended
Dec. 31, 2021
PROPERTY AND EQUIPMENT
7. PROPERTY AND EQUIPMENT
Property and equipment, net, consists of:
 
December 31,
   
2021
     
2020
  
Land
   
$
676
 
    $ 741  
Buildings and improvement
s
   
 
85,857
 
      80,877  
Machinery, vehicles, and equipment
   
 
108,110
 
      92,577  
Computer hardware and software
   
 
68,762
 
      62,776  
Furniture and fixtures
 
21,404
 
  19,077  
    
 
 
     
 
 
  
 
 
284,809
 
   256,048  
Accumulated depreciation and amortization
   
 
(173,790
) 
      (157,823 ) 
    
 
 
     
 
 
  
    
$
111,019
 
    $ 98,225  
    
 
 
     
 
 
  
Depreciation and amortization expense related to property and equipment included in selling, general and administrative expenses for the years ended December 31, 2021, 2020, and 2019, were $22,566, $19,963, and $18,808, respectively.