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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Fair value assumptions of stock options The following assumptions were used in estimating the fair value for options granted in 2017, 2016 and 2015.
 
2017
2016
2015
Dividend yield
2.00
%
2.50
%
2.00
%
Risk-free interest rate
2.00
%
2.00
%
2.00
%
Weighted average expected volatility
25.00
%
25.00
%
20.00
%
Weighted average expected life
5.5 years

5.5 years

6 years

Weighted average per share fair value of options
$5.30
$3.36
$3.08
Summary of Company's Stock Option Activities A summary of the Corporation’s stock option activity for the year ended December 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
(1,551,669
)
16.87

 
 
Forfeited or expired
(487,045
)
31.84

 
 
Outstanding at December 31, 2017
5,118,687

$
18.02

6.48
$
38,028

Options Exercisable at December 31, 2017
2,831,736

$
16.31

5.23
$
25,738
Summary of Restricted Stock Awards Activity (Excluding Salary Shares) The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2017.
Restricted Stock
Shares
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2016
2,377,380

$
17.40

Granted
767,627

25.54

Vested
(999,917
)
18.01

Forfeited
(119,019
)
20.00

Outstanding at December 31, 2017
2,026,071

$
19.68