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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes information about RSUs during 2017 and 2016:
 
2017
 
2016
 
Shares
 
Weighted average grant date fair value
 
Shares
 
Weighted average grant date fair value
Outstanding - beginning of the year
1,609,459

 
$
17.50

 
1,727,214

 
$
18.30

Granted
1,995,473

 
13.24

 
826,546

 
17.20

Vested
(784,295
)
 
19.42

 
(822,290
)
 
19.91

Forfeited
(169,584
)
 
14.76

 
(122,011
)
 
19.97

Outstanding - end of the year
2,651,053

 
$
14.16

 
1,609,459

 
$
17.50
Schedule of Share-based Compensation, Performance Stock Units Award Activity
The following table summarizes share information about PSUs during 2017:
 
Years Ended December 31,
 
2017
 
2016
Outstanding - beginning of the year
379,898

 
1,107,515

Granted
1,073,934

 
889,599

Performance adjustments
(226,154
)
 
(1,400,425
)
Forfeited
(82,653
)
 
(216,791
)
Outstanding - end of the year
1,145,025

 
379,898
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes information about stock option activity during 2017 and 2016:
 
2017
 
2016
 
Shares
 
Per share weighted average exercise prices
 
Shares
 
Per share weighted average exercise prices
Options outstanding - beginning of the year
9,122,762

 
$
27.13

 
8,771,600

 
$
31.26

Granted
2,553,510

 
13.16

 
1,758,760

 
16.87

Canceled
(63,517
)
 
20.34

 
(157,176
)
 
19.48

Expired
(1,117,716
)
 
46.88

 
(1,250,422
)
 
42.62

Options outstanding - end of the year
10,495,039

 
$
21.67

 
9,122,762

 
$
27.13

Options exercisable - end of the year
6,690,250

 
$
25.57

 
7,140,772

 
$
27.47
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The following table provides additional information about stock options outstanding and exercisable at December 31, 2017:
 
 
Options Outstanding
 
Options Exercisable
Range of per share exercise prices
 
Shares
 
Per share weighted-average exercise price
 
Weighted-average remaining contractual life
 
Shares
 
Per share weighted-average exercise price
 
Weighted-average remaining contractual life
$13.11 - $14.26
 
2,653,510

 
$
13.17

 
8.9
 years
 
100,000

 
$
13.39

 
4.9
 years
$14.27 - $21.89
 
2,347,595

 
17.07

 
7.2
 years
 
1,296,316

 
17.22

 
6.4
 years
$21.90 - $24.77
 
2,683,597

 
23.29

 
2.3
 years
 
2,683,597

 
23.29

 
2.3
 years
$24.78 - $36.96
 
2,810,337

 
31.98

 
1.8
 years
 
2,610,337

 
32.53

 
1.3
 years
 
 
10,495,039

 
$
21.67

 
4.9
 years
 
6,690,250

 
$
25.57

 
2.8
 years
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The follow table lists the weighted average of assumptions used to calculate the fair value of stock options granted during 2016 and 2015:
 
Years Ended December 31,
 
2017
 
2016
Expected dividend yield
5.7
%
 
4.5
%
Expected stock price volatility
29.7
%
 
29.0
%
Risk-free interest rate
2.3
%
 
1.6
%
Expected life
7 years

 
7 years

Weighted-average fair value per option granted
$2.00
 
$2.85
Fair value of options granted
$5,107
 
$5,013