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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018:
 
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, 2017
4,752
 
$
8.86

 
 
 
 
Granted
474
 
9.40

 
 
 
 
Exercised
(148)
 
7.10

 
 
 
 
Forfeited or expired
(335)
 
11.40

 
 
 
 
Outstanding at December 31, 2018
4,743
 
$
8.79

 
7.07
 
$
1,443

Fully vested at December 31, 2018 and expected to vest thereafter
4,673
 
$
8.77

 
7.05
 
$
1,443

Exercisable at December 31, 2018
2,634
 
$
8.06

 
6.05
 
$
1,423
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,
 
2018
 
2017
 
2016
Expected life (in years)
6.0

 
5.7

 
6.5

Risk-free interest rate
2.7
%
 
1.9
%
 
1.5
%
Volatility
42
%
 
43
%
 
48
%
Dividend yield
—

 
—

 
—

Weighted-average grant date fair value per option granted
$
4.17

 
$
4.24

 
$
2.89
Restricted share activity
The following table summarizes our restricted share activity for the year ended December 31, 2018:
 
Number of
Shares
(In thousands)
 
Weighted- average
Grant Date
Fair Value
(Per Share)
Non-vested at December 31, 2017
188

 
$
10.15

Awards granted
35

 
8.56

Awards vested
(76
)
 
10.43

Awards forfeited
—

 
—

Non-vested at December 31, 2018
147

 
9.63