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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2014
Employee Benefit and Other Plans [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
Share-based Compensation: As of March 31, 2014, we had approximately 6.6 million share-based awards outstanding, including common stock options, restricted stock units and performance stock units which are detailed below. In addition, we had approximately 2.4 million share-based awards available for grant. We recorded share-based compensation expense as follows:
 
For the three months ended March 31,
 
2014
 
2013
 
(in millions)
Share-based compensation expense
$
3.2

 
$
1.8


Stock options: The following table summarizes information related to our common stock options:
 
Number of
Stock Options
 
Weighted Average
Exercise Price
Options outstanding at January 1, 2014
5,509,246

 
$
14.01

Granted
128,700

 
$
23.08

Exercised
(161,022
)
 
$
13.44

Canceled or forfeited
(118,200
)
 
$
18.01

Options outstanding at March 31, 2014
5,358,724

 
$
14.15

Options exercisable at March 31, 2014
2,748,717

 
$
12.34

Expected to vest after March 31, 2014
1,989,323

 
$
16.32


The unamortized compensation costs not yet expensed related to stock options totaled approximately $17.5 million at March 31, 2014 and the weighted average period over which the costs are expected to be recognized is approximately two years. The aggregate amount of cash we received from the exercise of stock options was $2.3 million and $1.0 million for the three months ended March 31, 2014 and 2013, respectively. The associated shares were newly issued common stock. The following information is provided for our stock options:
 
For the three months ended
March 31,
 
2014
 
2013
Weighted-average grant date fair value
$
9.68

 
$
7.82


Restricted Stock Units: The following table summarizes information related to our restricted stock units:
 
Number of
Shares
 
Weighted Average
Grant Date Fair Value
Unvested shares at January 1, 2014
629,518

 
$
20.11

Granted
114,138

 
$
23.64

Vested
(19,115
)
 
$
13.42

Canceled or forfeited
(34,585
)
 
$
22.22

Unvested shares at March 31, 2014
689,956

 
$
20.99



Unamortized compensation costs not yet expensed attributable to non-vested shares totaled approximately $12.7 million at March 31, 2014 and the weighted average period over which the costs are expected to be recognized is approximately two years.

Performance Stock Units: The following table summarizes information related to our performance stock units:
 
Number of
Shares
 
Weighted Average
Grant Date Fair Value
Unvested shares at January 1, 2014
431,858

 
$
22.79

Granted
123,283

 
$
26.50

Canceled or forfeited
—

 
$
—

Unvested shares at March 31, 2014
555,141

 
$
23.61