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Employee Benefits And Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
 
(In thousands)
Cost of revenues
$
7,030

 
$
7,253

 
$
7,009

Sales and marketing
5,688

 
5,738

 
6,763

Research and development
6,113

 
6,739

 
6,488

General and administrative
34,076

 
30,314

 
25,815

Total stock-based compensation
$
52,907

 
$
50,044

 
$
46,075
Nature Of Total Stock-Based Compensation
The following table presents the nature of the Company’s total stock-based compensation:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
RSUs
$
38,087

 
$
37,325

 
$
36,664

Performance-based RSUs
13,270

 
11,512

 
8,078

ESPP
4,005

 
3,593

 
4,051

Capitalization (Included in Property and equipment, net)
(2,455
)
 
(2,386
)
 
(2,718
)
Total stock-based compensation expenses
$
52,907

 
$
50,044

 
$
46,075
Summary Of Unvested RSUs Activity
The following table summarizes unvested RSUs activity:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Shares
 
Weighted-Average Grant-Date Fair Value
 
Shares
 
Weighted-Average Grant-Date Fair Value
 
Shares
 
Weighted-Average Grant-Date Fair Value
 
(Shares in thousands)
Unvested at beginning of period
1,846

 
$
66.30

 
2,110

 
$
54.77

 
2,179

 
$
46.36

Granted
732

 
79.94

 
760

 
78.58

 
1,075

 
61.74

Vested and settled
(885
)
 
61.75

 
(873
)
 
49.95

 
(932
)
 
43.92

Forfeited
(105
)
 
72.90

 
(151
)
 
61.57

 
(212
)
 
51.47

 
1,588

 
$
74.69

 
1,846

 
$
66.30

 
2,110

 
$
54.77