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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 consisted of the following:
 
 
Weighted Average Useful Life
(in years)
 
As of  
 December 31, 
 2018
 
As of  
 December 31, 
 2017
Computer hardware
 
3
 
$
74,884

 
$
62,132

Building
 
49
 
34,458

 
34,058

Leasehold improvements
 
9
 
25,036

 
13,186

Furniture and fixtures
 
7
 
21,544

 
18,071

Office equipment
 
7
 
13,203

 
10,825

Purchased computer software
 
4
 
10,406

 
8,379

Land improvements
 
20
 
1,474

 
1,474

 
 
 
 
181,005

 
148,125

Less accumulated depreciation and amortization
 
 
 
(78,359
)
 
(61,706
)
Total
 
 
 
$
102,646

 
$
86,419


Depreciation and amortization expense related to property and equipment was $28,539, $21,000 and $15,217 during the years ended December 31, 2018, 2017 and 2016, respectively.