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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
Property and Equipment, Net
Property and equipment consisted of the following (in thousands):
 
 
 
December 31,
 
 
2016
 
2015
Computer hardware
 
$
170,746

 
$
162,346

Computer software
 
374,490

 
339,634

Furniture and equipment
 
100,472

 
96,536

Leasehold improvements
 
133,541

 
118,491

Other
 
9,993

 
9,560

Property and equipment, cost
 
789,242

 
726,567

Accumulated depreciation
 
(627,733
)
 
(583,661
)
Property and equipment, net
 
$
161,509

 
$
142,906