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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2014
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 year ended December 31, 2014:
 
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, 2013
4,873
 
$
6.52

 
 
 
 
Granted
330
 
8.15

 
 
 
 
Exercised
(1,011)
 
6.18

 
 
 
 
Forfeited or expired
(370)
 
11.71

 
 
 
 
Outstanding at December 31, 2014
3,822
 
$
6.25

 
6.61
 
$
6,376

Fully vested at December 31, 2014 and expected to vest thereafter
3,798
 
$
6.26

 
6.59
 
$
6,325

Exercisable at December 31, 2014
2,113
 
$
7.17

 
4.93
 
$
2,454
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 Year Ended December 31,
 
2014
 
2013
 
2012
Expected life (in years)
6.1

 
6.2

 
6.0

Risk-free interest rate
2.0
%
 
1.7
%
 
1.0
%
Volatility
57
%
 
60
%
 
65
%
Dividend yield
—

 
—

 
—

Weighted average grant date fair value per option granted
$
4.46

 
$
2.49

 
$
2.68
Restricted share activity

The following table summarizes our restricted share activity for the year ended December 31, 2014:
 
Number of
Shares
(In thousands)
 
Weighted Average
Grant Date
Fair Value
(Per Share)
Nonvested at December 31, 2013
1,172

 
$
4.83

Awards granted
—

 
—

Awards vested
(479
)
 
5.18

Awards forfeited
(33
)
 
4.68

Nonvested at December 31, 2014
660

 
$
4.58