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Property and Equipment, net (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
Property and equipment consisted of the following at December 31, 2017 and 2016 (in thousands):
 
December 31,
 
2017
 
2016
Computer equipment, software, and internally developed software
$
83,568

 
$
65,973

Furniture and fixtures
4,779

 
3,705

Leasehold improvements
8,342

 
6,067

Capitalized facility leases
39,302

 
39,302

 
135,991

 
115,047

Less: Accumulated depreciation
(65,281
)
 
(48,106
)
Total property and equipment, net
$
70,710

 
$
66,941