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Property, Equipment and Software, Net (Tables)
 3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Equipment and Software
Property, equipment and software, net, consist of the following:
 
March 31, 
 2018
 
December 31, 
 2017
Internally developed software (1)
$
112,169

 
$
107,370

Leasehold improvements
27,190

 
26,949

Computer equipment
21,391

 
20,324

Purchased software
8,151

 
8,284

Furniture and fixtures
7,613

 
7,567

Construction in progress
2,296

 
1,202

Total property, equipment and software
178,810

 
171,696

Accumulated depreciation and amortization
(71,633
)
 
(69,763
)
Total property, equipment and software, net
$
107,177

 
$
101,933

(1)
Includes $12.4 million and $10.7 million in development in progress as of March 31, 2018 and December 31, 2017, respectively.