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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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 2015, 2014 and 2013.
 
2015
 
2014
 
2013
Dividend yield
2.00
%
 
2.00
%
 
2.00
%
Risk-free interest rate
2.00
%
 
2.00
%
 
0.99
%
Weighted average expected volatility
20.00
%
 
20.00
%
 
34.35
%
Weighted average expected life
6 years

 
6 years

 
6 years

Weighted average per share fair value of options
$3.08
 
$3.00
 
$3.80
Summary of Company's Stock Option Activities
A summary of the Corporation’s stock option activity for 2015, 2014, and 2013, is presented below.
Stock Options
Shares
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value (000s)
Outstanding at December 31, 2012
8,640,558

 
$
18.88

 
 
 
 
Granted
1,020,979

 
14.02

 
 
 
 
Exercised
(642,202
)
 
13.43

 
 
 
 
Forfeited or expired
(985,092
)
 
21.49

 
 
 
 
Outstanding at December 31, 2013
8,034,243

 
$
18.37

 
6.03
 
$
20,838

Options Exercisable at December 31, 2013
4,923,720

 
$
21.48

 
4.62
 
$
8,580

Granted
1,389,452

 
$
17.45

 
 
 
 
Exercised
(933,143
)
 
13.77

 
 
 
 
Forfeited or expired
(643,214
)
 
23.50

 
 
 
 
Outstanding at December 31, 2014
7,847,338

 
$
18.34

 
5.79
 
$
23,986

Options Exercisable at December 31, 2014
5,076,676

 
$
19.96

 
4.41
 
$
14,953

Granted
1,348,504

 
$
17.95

 
 
 
 
Exercised
(1,351,646
)
 
13.90

 
 
 
 
Forfeited or expired
(1,215,053
)
 
29.13

 
 
 
 
Outstanding at December 31, 2015
6,629,143

 
$
17.22

 
6.24
 
$
18,730

Options Exercisable at December 31, 2015
4,190,245

 
$
17.25

 
4.93
 
$
14,873
Summary of Company's Nonvested Stock Option Activities
The following table summarizes information about the Corporation’s nonvested stock option activity for 2015, 2014, and 2013.
Stock Options
Shares
 
Weighted Average
Grant Date Fair Value
Nonvested at December 31, 2012
4,036,595

 
$
5.11

Granted
1,020,979

 
3.80

Vested
(1,680,981
)
 
5.10

Forfeited
(266,070
)
 
5.05

Nonvested at December 31, 2013
3,110,523

 
$
4.69

Granted
1,389,452

 
3.00

Vested
(1,522,152
)
 
4.92

Forfeited
(207,161
)
 
4.38

Nonvested at December 31, 2014
2,770,662

 
$
3.74

Granted
1,348,504

 
3.08

Vested
(1,459,709
)
 
4.19

Forfeited
(220,559
)
 
3.28

Nonvested at December 31, 2015
2,438,898

 
$
3.15
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)
The following table summarizes information about the Corporation’s restricted stock activity for 2015, 2014, and 2013.
Restricted Stock
Shares
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2012
932,425

 
$
13.60

Granted
1,276,868

 
14.03

Vested
(626,480
)
 
13.68

Forfeited
(71,048
)
 
13.92

Outstanding at December 31, 2013
1,511,765

 
$
13.92

Granted
1,177,168

 
17.35

Vested
(538,877
)
 
14.12

Forfeited
(167,930
)
 
15.26

Outstanding at December 31, 2014
1,982,126

 
$
15.79

Granted
1,173,847

 
18.09

Vested
(709,582
)
 
15.62

Forfeited
(196,363
)
 
16.87

Outstanding at December 31, 2015
2,250,028

 
$
17.03