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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Fair value assumptions of stock options
The following assumptions were used in estimating the fair value for options granted in the first three months of 2017 and full year 2016.
 
2017
 
2016
Dividend yield
2.00
%
 
2.50
%
Risk-free interest rate
2.00
%
 
2.00
%
Weighted average expected volatility
25.00
%
 
25.00
%
Weighted average expected life
5.5 years

 
5.5 years

Weighted average per share fair value of options
$5.30
 
$3.36
Summary of Company's Stock Option Activities
A summary of the Corporation’s stock option activity for the three months ended March 31, 2017 is presented below.
Stock Options
Shares
 
Weighted Average
Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2016
6,357,843

 
$
17.67

 
6.10
 
$
47,902

Granted
799,558

 
$
25.61

 
 
 
 
Exercised
(1,038,549
)
 
16.28

 
 
 
 
Forfeited or expired
(432,001
)
 
33.74

 
 
 
 
Outstanding at March 31, 2017
5,686,851

 
$
18.07

 
7.00
 
$
37,180

Options Exercisable at March 31, 2017
3,153,070

 
$
16.47

 
5.59
 
$
25,258
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)
The following table summarizes information about the Corporation’s restricted stock activity for the three months ended March 31, 2017.
Restricted Stock
Shares
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2016
2,377,380

 
$
17.40

Granted
729,135

 
25.59

Vested
(788,033
)
 
17.87

Forfeited
(52,838
)
 
17.92

Outstanding at March 31, 2017
2,265,644

 
$
19.86