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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of all common stock option activity
The following table summarizes our stock option activity for the year ended December 31, 2019:
 
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, 2018
4,743
 
$
8.79

 
 
 
 
Granted
3,100
 
9.10

 
 
 
 
Exercised
(1,442)
 
7.91

 
 
 
 
Forfeited or expired
(556)
 
9.39

 
 
 
 
Outstanding at December 31, 2019
5,845
 
$
9.11

 
7.74
 
$
22,738

Fully vested at December 31, 2019 and expected to vest thereafter
5,718
 
$
9.11

 
7.71
 
$
22,256

Exercisable at December 31, 2019
2,140
 
$
8.87

 
6.04
 
$
8,829
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,
 
2019
 
2018
 
2017
Expected life (in years)
6.0

 
6.0

 
5.7

Risk-free interest rate
2.5
%
 
2.7
%
 
1.9
%
Volatility
43
%
 
42
%
 
43
%
Dividend yield
—

 
—

 
—

Weighted-average grant date fair value per option granted
$
4.06

 
$
4.17

 
$
4.24
Restricted share activity
The following table summarizes our restricted share activity for the year ended December 31, 2019:
 
Number of
Shares
(In thousands)
 
Weighted- average
Grant Date
Fair Value
(Per Share)
Non-vested at December 31, 2018
147

 
$
9.63

Awards granted
82

 
7.29

Awards vested
(83
)
 
9.32

Awards forfeited
—

 
—

Non-vested at December 31, 2019
146

 
8.48