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Stock Awards (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information About Outstanding And Vested Stock Options
A summary of the stock option activity for the year ended December 31, 2013 is as follows:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2011
39,601,640

 
$
2.20

 
 
 
 
Granted
7,695,730

 
15.03

 
 
 
 
Exercised
(6,654,558
)
 
0.76

 
 
 
$
84,215

Canceled/forfeited
(4,527,352
)
 
3.35

 
 
 
 
Outstanding at December 31, 2012
36,115,460

 
5.05

 
 
 
 
Granted
2,339,523

 
38.07

 
 
 
 
Exercised
(12,951,123
)
 
3.34

 
 
 
$
446,054

Canceled/forfeited
(2,104,486
)
 
7.66

 
 
 
 
Outstanding at December 31, 2013
23,399,374

 
$
9.07

 
7.70
 
$
1,097,746

Vested and expected to vest as of December 31, 2013
22,304,397

 
$
8.71

 
7.73
 
$
1,054,997

Vested and exercisable as of December 31, 2013
9,333,628

 
$
4.43

 
7.30
 
$
481,448
Restricted Stock Unit Table
RSUs

Activity with respect to outstanding RSUs in the year ended December 31, 2013 was as follows:
 
Number of
Shares
 
Weighted Average Grant Date Fair Value
(Per Share)
 
Aggregate
Fair Value
(in thousands)
Outstanding at December 31, 2011
—

 
$
—

 
 
Granted
1,470,072

 
17.02

 
 
Vested
—

 
—

 
$
—

Forfeited
(12,202
)
 
31.97

 
 
Outstanding at December 31, 2012
1,457,870

 
16.89

 
 
Granted
4,558,929

 
38.15

 
 
Vested
(322,623
)
 
15.15

 
$
13,510

Forfeited
(266,667
)
 
30.65

 
 
Outstanding at December 31, 2013
5,427,509

 
$
34.02

 
$
303,995

Expected to vest as of December 31, 2013
5,018,553

 
 
 
$
281,089