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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Classification Of Stock-Based Compensation
The following table presents the classification of stock-based compensation:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
2018
 
2017
 
2018
 
2017
 
(In thousands)
Cost of revenues
$
1,818

 
$
1,802

 
$
3,428

 
$
3,537

Sales and marketing
1,494

 
1,457

 
2,942

 
2,886

Research and development
1,688

 
1,482

 
3,409

 
2,978

General and administrative
8,298

 
8,634

 
16,497

 
16,537

Total stock-based compensation expense
$
13,298

 
$
13,375

 
$
26,276

 
$
25,938
Nature Of Total Stock-Based Compensation
The following table presents the nature of the Company’s total stock-based compensation:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
RSUs
$
9,406

 
$
9,220

 
$
18,693

 
$
18,374

Performance-based RSUs
3,360

 
3,804

 
6,473

 
6,892

ESPP
1,059

 
960

 
2,109

 
1,941

Capitalization (included in Property and equipment, net)
(527
)
 
(609
)
 
(999
)
 
(1,269
)
Total stock-based compensation expense
$
13,298

 
$
13,375

 
$
26,276

 
$
25,938