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Property, Equipment and Software, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Equipment and Software
Property, equipment and software, net, consist of the following:
December 31,
2017
 
2016
Internally developed software (1)
$
107,370

 
$
75,202

Leasehold improvements
26,949

 
22,637

Computer equipment
20,324

 
18,080

Purchased software
8,284

 
7,598

Furniture and fixtures
7,567

 
6,827

Construction in progress
1,202

 
707

Total property, equipment and software
171,696

 
131,051

Accumulated depreciation and amortization
(69,763
)
 
(41,788
)
Total property, equipment and software, net
$
101,933

 
$
89,263


(1) 
Includes $10.7 million and $7.4 million in development in progress as of December 31, 2017 and 2016, respectively.