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PROPERTY AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment Depreciation and amortization are calculated on a straight-line basis over the following estimated useful lives of the assets:

Leasehold improvements
 
Shorter of lease term or useful life
Computer hardware and software
 
Three to five years
Furniture and office equipment
 
Five to ten years
Vehicles
 
Five years
Aircraft
 
Ten to twenty years


Property and equipment consists of the following (in thousands):
 
 
December 31,
 
2019
 
2018
Leasehold improvements
$
73,918

 
$
65,332

Furniture, office equipment and vehicles
60,768

 
50,224

Computer hardware and software
80,947

 
74,742

Aircraft
27,657

 
2,796

Property and equipment, gross
243,290

 
193,094

Accumulated depreciation and amortization
(135,761
)
 
(109,791
)
Property and equipment, net
$
107,529

 
$
83,303