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Share-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of all common stock option activity
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
Assumptions used in valuing the weighted average fair values of the options granted
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
Restricted share activity
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