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Share-Based Compensation Plans
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Plans
4.    Share-Based Compensation Plans

The following table summarizes our share-based compensation expense attributable to stock options and restricted shares:
 
For the Three Months Ended
September 30,
 
For the Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Share-based compensation expense
$
824

 
$
816

 
$
2,449

 
$
3,063



We recognized our share-based compensation costs 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 nine months ended September 30, 2016:
 
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, 2015
3,727

 
$
6.49

 
 
 
 

Granted
415

 
5.73

 
 
 
 

Exercised
(533
)
 
4.88

 
 
 
 

Forfeited or expired
(274
)
 
6.63

 
 
 
 

Outstanding at September 30, 2016
3,335

 
$
6.65

 
6.06
 
$
11,051

Fully vested at September 30, 2016 and expected to vest thereafter
3,304

 
$
6.65

 
6.03
 
$
10,938

Exercisable at September 30, 2016
2,337

 
$
7.05

 
5.06
 
$
7,020



The following assumptions were used to calculate the weighted average fair values of the options granted:
 
For the Three Months Ended
September 30,
 
For the Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Expected life (in years)
5.9

 
6.0

 
6.5

 
5.8

Risk-free interest rate
1.4
%
 
1.8
%
 
1.5
%
 
1.8
%
Volatility
43
%
 
44
%
 
48
%
 
45
%
Dividend yield
—

 
—

 
—

 
—

Weighted average grant date fair value per option granted
$
3.78

 
$
2.33

 
$
2.78

 
$
3.20


 
Total unrecognized compensation expense from stock options was $2.4 million as of September 30, 2016, which is expected to be recognized over a weighted-average period of approximately 2.0 years beginning October 1, 2016.
Restricted Shares

The following table summarizes our restricted share activity for the nine months ended September 30, 2016:
 
Number of
Shares
(In thousands)
 
Weighted
Average
Grant-Date
Fair Value
(Per share)
Non-vested at December 31, 2015
385

 
$
4.78

Awards granted
50

 
5.66

Awards vested
(226
)
 
4.91

Awards forfeited
(5
)
 
4.43

Non-vested at September 30, 2016
204

 
$
4.86



Total unrecognized compensation cost from restricted shares was $0.7 million as of September 30, 2016, which is expected to be recognized over a weighted average period of approximately 0.6 years beginning October 1, 2016.