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Property and Equipment, net
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
Property and Equipment, net
Property and equipment, net consists of the following (in thousands):
 
 
December 31,
 
 
2018
 
2017
Machinery and equipment
 
$
6,888

 
$
4,126

Leasehold improvements, furniture, and computer hardware
 
14,755

 
13,709

Vehicles
 
55,093

 
43,413

Computer software
 
32,768

 
30,483

Total property and equipment
 
109,504

 
91,731

Less: Accumulated depreciation and amortization
 
(74,611
)
 
(55,329
)
Total property and equipment, net
 
$
34,893

 
$
36,402


Depreciation and amortization expense was $20.4 million, $19.5 million and $18.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.