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Share-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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
240

 
7.69

 
 
 
 

Exercised
(141
)
 
4.70

 
 
 
 

Forfeited or expired
(119
)
 
4.28

 
 
 
 

Outstanding at June 30, 2015
3,802

 
$
6.46

 
6.22
 
$
3,226

Fully vested at June 30, 2015 and expected to vest thereafter
3,779

 
$
6.47

 
6.21
 
$
3,201

Exercisable at June 30, 2015
2,469

 
$
7.03

 
5.02
 
$
1,696
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
June 30,
 
For the Six Months Ended
June 30,
 
2015
 
2014
 
2015
 
2014
Expected life (in years)
5.5

 
6.0

 
5.7

 
6.1

Risk-free interest rate
1.8
%
 
2.0
%
 
1.8
%
 
2.0
%
Volatility
43
%
 
57
%
 
46
%
 
58
%
Dividend yield
—

 
—

 
—

 
—

Weighted average grant date fair value per option granted
$
2.83

 
$
5.01

 
$
3.48

 
$
4.20
Restricted share activity
The following table summarizes our restricted share activity for the six months ended June 30, 2015:
 
Number of
Shares
(In thousands)
 
Weighted
Average
Grant-Date
Fair Value
(Per share)
Nonvested at December 31, 2014
660

 
$
4.58

Awards granted
49

 
7.30

Awards vested
(162
)
 
5.03

Awards forfeited
(22
)
 
4.47

Nonvested at June 30, 2015
525

 
$
4.70