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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of the most recent option activity is as follows:

 
 
Options
Weighted Average Exercise Price
Outstanding — December 31, 2012
2,751,163

$
8.01

Exercised
(1,756,629
)
6.66

Canceled
(994,534
)
10.40

Outstanding — December 31, 2013
—

$
—
RSUs and Stock Awards Granted
Data concerning RSUs and stock awards granted in the years ended December 31:

 
2015
2014
2013
RSUs — Employees
1,751,823

2,153,885

3,335,039

Weighted-average grant date fair value
$
13.28

$
10.22

$
7.34

Stock Awards — Board of Directors
54,120

77,139

103,842

Weighted-average grant date fair value
$
14.78

$
10.50

$
7.80
Summary of Nonvested RSU Activity
A summary of the changes in the number of unvested RSUs from December 31, 2012 to December 31, 2015 is presented below:

 
 
 
Shares
Weighted Average Grant Date Fair Value
Outstanding — December 31, 2012
12,310,287

$
4.63

Granted
3,335,039

7.34

Released
(5,299,116
)
3.94

Forfeited
(510,077
)
5.94

Outstanding — December 31, 2013
9,836,133

$
5.86

Granted
2,153,885

10.22

Released
(3,619,979
)
5.18

Forfeited
(756,341
)
7.45

Outstanding — December 31, 2014
7,613,698

$
7.20

Granted
1,751,823

13.28

Released
(3,657,373
)
5.45

Forfeited
(268,560
)
9.32

Outstanding — December 31, 2015
5,439,588

$
10.22