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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock options outstanding under equity-based compensation plans
Stock Options
A summary of the changes in stock options outstanding during the three months ended March 31, 2014 is presented below:


Number of
Options

Weighted
Average
Remaining
Contract Term
(Years)

Weighted Average Exercise Price

Aggregate Intrinsic Value
Options outstanding as of December 31, 2013

2.6


4.2

$
10.46


$
17.8

Granted

0.4




16.03


—

Exercised

—




—


0.2

Canceled

(1.1
)



9.04


—

Options outstanding as of March 31, 2014

1.9


7.7

$
12.62


$
5.0

Options exercisable as of March 31, 2014

0.9


6.6

$
11.00


$
3.5
RSUs outstanding under equity-based compensation plans
Restricted Stock Units
 
A summary of the changes in RSUs outstanding during the three months ended March 31, 2014 is presented below:
 
 
Number of
RSUs
 
Weighted Average Grant Date Fair Value Per RSU
Unvested units as of December 31, 2013
 
5.2

 
$
11.93

Granted
 
1.4

 
16.02

Vested
 
(1.7
)
 
10.09

Canceled
 
(0.1
)
 
13.84

Unvested units as of March 31, 2014
 
4.8

 
$
13.76