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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 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 year ended December 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
390
 
6.99

 
 
 
 
Exercised
(205)
 
4.57

 
 
 
 
Forfeited or expired
(280)
 
5.28

 
 
 
 
Outstanding at December 31, 2015
3,727
 
$
6.49

 
5.96
 
$
3,230

Fully vested at December 31, 2015 and expected to vest thereafter
3,709
 
$
6.50

 
5.95
 
$
3,213

Exercisable at December 31, 2015
2,571
 
$
6.91

 
4.92
 
$
2,018
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,
 
2015
 
2014
 
2013
Expected life (in years)
5.8

 
6.1

 
6.2

Risk-free interest rate
1.8
%
 
2.0
%
 
1.7
%
Volatility
45
%
 
57
%
 
60
%
Dividend yield
—

 
—

 
—

Weighted average grant date fair value per option granted
$
3.14

 
$
4.46

 
$
2.49
Restricted share activity
The following table summarizes our restricted share activity for the year ended December 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
49

 
7.30

Awards vested
(289
)
 
4.79

Awards forfeited
(35
)
 
4.46

Nonvested at December 31, 2015
385

 
$
4.78