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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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 2016, 2015 and 2014.
 
2016
 
2015
 
2014
Dividend yield
2.50
%
 
2.00
%
 
2.00
%
Risk-free interest rate
2.00
%
 
2.00
%
 
2.00
%
Weighted average expected volatility
25.00
%
 
20.00
%
 
20.00
%
Weighted average expected life
5.5 years

 
6 years

 
6 years

Weighted average per share fair value of options
$3.36
 
$3.08
 
$3.00
Summary of Company's Stock Option Activities
A summary of the Corporation’s stock option activity for the year ended December 31, 2016 is presented below.
Stock Options
Shares
Weighted Average
Exercise Price
Weighted Average
Remaining
Contractual Term
Aggregate
Intrinsic
Value (000s)
Outstanding at December 31, 2015
6,629,143

$
17.22

6.24
$
18,730

Granted
1,302,298

17.45

 
 
Exercised
(1,389,146
)
14.81

 
 
Forfeited or expired
(184,452
)
21.62

 
 
Outstanding at December 31, 2016
6,357,843

$
17.67

6.10
$
47,902

Options Exercisable at December 31, 2016
3,632,749

$
17.85

4.45
$
28,109
Summary of Company's Nonvested Stock Option Activities
The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2016.
Nonvested Stock Options
Shares
Weighted Average
Grant Date Fair Value
Nonvested at December 31, 2015
2,438,898

$
3.15

Granted
1,302,298

3.36

Vested
(909,361
)
3.27

Forfeited
(106,741
)
3.39

Nonvested at December 31, 2016
2,725,094

$
3.21
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, 2016.
Restricted Stock
Shares
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2015
2,250,028

 
$
17.03

Granted
1,095,596

 
17.58

Vested
(864,617
)
 
16.62

Forfeited
(103,627
)
 
17.59

Outstanding at December 31, 2016
2,377,380

 
$
17.40