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Share-Based Compensation Plans
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Plans
4.    Share-Based Compensation Plans

For the three months ended March 31, 2015 and 2014, we recognized share-based compensation attributable to stock options and restricted shares of $1.4 million and $1.0 million, respectively, primarily in selling, general and administrative expenses. There were no corresponding deferred income tax benefits for stock options or restricted shares.

Stock Options

The following table summarizes our stock option activity for the three months ended March 31, 2015:
 
Number of
Shares
(In thousands)
 
Weighted Average
Exercise Price
Per Share
 
Weighted Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
(In thousands)
Outstanding at December 31, 2014
3,822

 
$
6.25

 
 
 
 

Granted
100

 
8.92

 
 
 
 

Exercised
(119
)
 
4.81

 
 
 
 

Forfeited or expired
(69
)
 
4.28

 
 
 
 

Outstanding at March 31, 2015
3,734

 
$
6.41

 
6.22
 
$
10,424

Fully vested at March 31, 2015 and expected to vest thereafter
3,706

 
$
6.41

 
6.21
 
$
10,329

Exercisable at March 31, 2015
2,244

 
$
7.00

 
4.83
 
$
5,330



The following assumptions were used to calculate the weighted average fair values of the options granted:
 
For the Three Months Ended
March 31,
 
2015
 
2014
Expected life (in years)
6.1

 
6.1

Risk-free interest rate
1.7
%
 
1.9
%
Volatility
50
%
 
59
%
Dividend yield
—

 
—

Weighted average grant date fair value per option granted
$
4.38

 
$
2.89


 
Total unrecognized compensation expense from stock options, net of a forfeiture estimate, was $3.6 million as of March 31, 2015, which is expected to be recognized over a weighted-average period of approximately 2.3 years beginning April 1, 2015.

Restricted Shares

The following table summarizes our restricted share activity for the three months ended March 31, 2015:
 
Number of
Shares
(In thousands)
 
Weighted
Average
Grant-Date
Fair Value
(Per share)
Nonvested at December 31, 2014
660

 
$
4.58

Awards granted
8

 
9.85

Awards vested
(89
)
 
5.27

Awards forfeited
(17
)
 
4.46

Nonvested at March 31, 2015
562

 
$
4.55



Total unrecognized compensation cost from restricted shares, net of a forfeiture estimate, was $2.2 million as of March 31, 2015, which is expected to be recognized over a weighted average period of approximately 2.0 years beginning April 1, 2015.