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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of accumulated other comprehensive loss
The components of accumulated other comprehensive loss, net of tax were as follows (in thousands):

 
As of December 31,
 
2019
 
2018
Foreign currency translation adjustment
$
(7,855
)
 
$
(10,958
)
Net unrealized loss on investments
(730
)
 
(730
)
Total accumulated other comprehensive loss
$
(8,585
)
 
$
(11,688
)
Stock-based compensation expense for stock options and restricted stock
Stock-based compensation expense for stock options and restricted stock awards issued under equity incentive plans and stock purchases under the Employee Stock Purchase Plan ("ESPP") included in the Company’s results of operations were as follows (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Cost of revenues (1)
                                                                                            
$
9,273

 
$
7,688

 
$
4,971

Selling and marketing (excluding customer base amortization)
6,809

 
6,881

 
7,086

Software development                                                                                              
8,985

 
7,454

 
7,071

General and administrative                                                                                              
27,188

 
20,695

 
19,902

Total stock-based compensation
$
52,255

 
$
42,718

 
$
39,030

__________________________
 
 
 
 
 
(1) For the year ended December 31, 2018, stock-based compensation expense includes $1.5 million of expense related to the cash settlement of stock options in connection with the acquisition of Cozy Services, Ltd. See Note 4 for details of the acquisition.
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