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Property And Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property And Equipment [Abstract]  
Property, Plant and Equipment
Property and equipment, stated at cost, at December 31, 2018 and 2017 consisted of the following (in thousands):
 
2018
 
2017
Computers and related equipment
$
272,067

 
$
215,631

Furniture and equipment
2,391

 
2,035

Leasehold improvements
14,706

 
16,163

 
289,164

 
233,829

Less: Accumulated depreciation and amortization
(190,351
)
 
(154,056
)
 Total property and equipment, net
$
98,813

 
$
79,773