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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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 2018 and 2017:
 
2018
 
2017
 
Shares
 
Weighted average grant date fair value
 
Shares
 
Weighted average grant date fair value
Outstanding - beginning of the year
2,651,053

 
$
14.16

 
1,609,459

 
$
17.50

Granted
1,754,098

 
12.36

 
1,995,473

 
13.24

Vested
(963,010
)
 
11.41

 
(784,295
)
 
19.42

Forfeited
(213,802
)
 
13.26

 
(169,584
)
 
14.76

Outstanding - end of the year
3,228,339

 
$
13.33

 
2,651,053

 
$
14.16
Schedule of Share-based Compensation, Performance Stock Units Award Activity
The following table summarizes share information about PSUs during 2018:
 
2018
 
2017
 
Shares
 
Weighted average grant date fair value
 
Shares
 
Weighted average grant date fair value
Outstanding - beginning of the year
1,145,025

 
$
13.43

 
379,898

 
$
25.01

Granted
733,148

 
12.64

 
1,073,934

 
10.51

Vested
(91,493
)
 
12.21

 
(258,688
)
 
13.17

Forfeited
(133,676
)
 
14.26

 
(50,119
)
 
26.10

Outstanding - end of the year
1,653,004

 
$
13.08

 
1,145,025

 
$
13.43
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes information about stock option activity during 2018 and 2017:
 
2018
 
2017
 
Shares
 
Per share weighted average exercise prices
 
Shares
 
Per share weighted average exercise prices
Options outstanding - beginning of the year
10,495,039

 
$
21.67

 
9,122,762

 
$
27.13

Granted
4,932,467

 
8.47

 
2,553,510

 
13.16

Canceled
(258,509
)
 
13.09

 
(63,517
)
 
20.34

Expired
(1,575,841
)
 
36.86

 
(1,117,716
)
 
46.88

Options outstanding - end of the year
13,593,156

 
$
15.30

 
10,495,039

 
$
21.67

Options exercisable - end of the year
6,824,433

 
$
20.23

 
6,690,250

 
$
25.57
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, 2018:
 
 
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
$5.99 - $13.11
 
4,537,267

 
$
8.02

 
9.7
 years
 
—

 
$
—

 
—

$13.16 - $17.71
 
4,903,330

 
14.72

 
7.3
 years
 
2,879,149

 
15.21

 
6.8
 years
$19.45 - $26.07
 
4,152,559

 
23.94

 
2.0
 years
 
3,945,284

 
23.90

 
1.7
 years
 
 
13,593,156

 
$
15.30

 
6.5
 years
 
6,824,433

 
$
20.23

 
3.9
 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 2018 and 2017:
 
Years Ended December 31,
 
2018
 
2017
 
2016
Expected dividend yield
9.9
%
 
5.7
%
 
4.5
%
Expected stock price volatility
37.8
%
 
29.7
%
 
29.0
%
Risk-free interest rate
2.8
%
 
2.3
%
 
1.6
%
Expected life
7 years

 
7 years

 
7 years

Weighted-average fair value per option granted
$1.26
 
$2.00
 
$2.85
Fair value of options granted
$6,229
 
$5,107
 
$5,013