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Share-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The following table summarizes our share-based compensation expense attributable to stock options and restricted shares:
 
For the Three Months Ended
September 30,
 
For the Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Share-based compensation expense
$
824

 
$
816

 
$
2,449

 
$
3,063
Summary of all common stock option activity
The following table summarizes our stock option activity for the nine months ended September 30, 2016:
 
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, 2015
3,727

 
$
6.49

 
 
 
 

Granted
415

 
5.73

 
 
 
 

Exercised
(533
)
 
4.88

 
 
 
 

Forfeited or expired
(274
)
 
6.63

 
 
 
 

Outstanding at September 30, 2016
3,335

 
$
6.65

 
6.06
 
$
11,051

Fully vested at September 30, 2016 and expected to vest thereafter
3,304

 
$
6.65

 
6.03
 
$
10,938

Exercisable at September 30, 2016
2,337

 
$
7.05

 
5.06
 
$
7,020
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
September 30,
 
For the Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Expected life (in years)
5.9

 
6.0

 
6.5

 
5.8

Risk-free interest rate
1.4
%
 
1.8
%
 
1.5
%
 
1.8
%
Volatility
43
%
 
44
%
 
48
%
 
45
%
Dividend yield
—

 
—

 
—

 
—

Weighted average grant date fair value per option granted
$
3.78

 
$
2.33

 
$
2.78

 
$
3.20
Restricted share activity
The following table summarizes our restricted share activity for the nine months ended September 30, 2016:
 
Number of
Shares
(In thousands)
 
Weighted
Average
Grant-Date
Fair Value
(Per share)
Non-vested at December 31, 2015
385

 
$
4.78

Awards granted
50

 
5.66

Awards vested
(226
)
 
4.91

Awards forfeited
(5
)
 
4.43

Non-vested at September 30, 2016
204

 
$
4.86