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Employee Benefits And Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]  
Classification Of Stock-Based Compensation
The following table presents the classification of stock-based compensation:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Cost of revenues
$
6,835

 
$
7,030

 
$
7,253

Sales and marketing
4,972

 
5,688

 
5,738

Research and development
6,728

 
6,113

 
6,739

General and administrative
33,969

 
34,076

 
30,314

Total stock-based compensation
$
52,504

 
$
52,907

 
$
50,044
Nature Of Total Stock-Based Compensation
The following table presents the nature of the Company’s total stock-based compensation:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
RSUs
$
38,005

 
$
38,087

 
$
37,325

PSUs
12,403

 
13,270

 
11,512

ESPP
4,166

 
4,005

 
3,593

Capitalization (Included in Property and equipment, net)
(2,070
)
 
(2,455
)
 
(2,386
)
Total stock-based compensation expenses
$
52,504

 
$
52,907

 
$
50,044
Summary Of Unvested RSUs Activity
The following table summarizes unvested RSUs activity for the year ended December 31, 2018:
 
Shares
 
Weighted-Average Grant-Date Fair Value
 
(Shares in thousands)
Unvested at beginning of period
1,588

 
$
74.69

Granted
474

 
$
112.74

PSU achievement adjustment
115

 
$
38.10

Vested and settled
(862
)
 
$
66.37

Forfeited
(93
)
 
$
88.43

 
1,222

 
$
90.88