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Share-Based Compensation Level 3 (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair values of our stock options are calculated using the following weighted average assumptions, based on the methods described above:
 
 
Years Ended December 31,
Assumptions
 
2018
 
2017
 
2016
Dividend yield
 
1.8%
 
2.0%
 
2.0%
Expected volatility
 
18.5%
 
19.0%
 
19.7%
Risk-free interest rate
 
2.4%
 
1.6%
 
1.0%
Expected holding period (years)
 
4.0
 
4.0
 
4.0
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The following table summarizes certain information with respect to stock option and restricted share compensation as included in our Consolidated Statement of Operations:
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Total pretax employee share-based compensation expense included in net income
$
15,626

 
$
14,788

 
$
14,056

Income tax benefit related to share-based compensation included in net income
$
3,998

 
$
5,416

 
$
6,427
Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table sets forth stock option activity for the year ended December 31, 2018 (shares reported in whole numbers):
 
Options
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2017
9,520,299

 
$
19.77

Granted
1,199,420

 
$
37.50

Exercised
(1,801,776
)
 
$
13.61

Outstanding at December 31, 2018
8,917,943

 
$
23.40

Exercisable at December 31, 2018
6,145,297

 
$
19.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
Set forth below is certain information related to stock options outstanding and exercisable at December 31, 2018 (shares reported in whole numbers):
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Price
 
Number
Outstanding at
December 31, 2018
 
Weighted-Average Remaining Contractual Life
(in years)
 
Weighted-
Average Exercise Price
 
Number
Exercisable at
December 31, 2018
 
Weighted-
Average Exercise Price
$ 0.00 — 10.00
 
3,127

 
0.1
 
$
9.09

 
3,127

 
$
9.09

$10.01 — 20.00
 
2,878,785

 
2.4
 
$
15.38

 
2,878,785

 
$
15.38

$20.01 — 30.00
 
4,836,611

 
5.1
 
$
24.68

 
3,263,385

 
$
23.73

$30.01 — 40.00
 
1,199,420

 
7.1
 
$
37.50

 
—

 
$
—

$0.00 — 40.00
 
8,917,943

 
4.5
 
$
23.40

 
6,145,297

 
$
19.81
Other Information Pertaining to Stock Option Activity [Table Text Block]
Other information pertaining to stock options was as follows (in thousands, except weighted-average grant date fair value):
 
Years Ended December 31,
 
2018
 
2017
 
2016
Weighted average grant-date fair value of stock options granted
$
5.52

 
$
3.90

 
$
4.01

Total fair value of stock options vested
$
6,857

 
$
7,425

 
$
7,690

Total intrinsic value of stock options exercised
$
48,643

 
$
56,946

 
$
37,284

Cash received from the exercise of stock options
$
24,517

 
$
33,611

 
$
17,662

Recognized compensation expense
$
6,648

 
$
6,909

 
$
7,633
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Restricted share award activity was as follows (shares reported in whole numbers):
 
Restricted
Share Awards
 
Weighted-Average
Grant-Date
Fair Value
Nonvested restricted share awards at December 31, 2017
441,811

 
$
25.70

Granted
177,944

 
$
37.50

Vested
(230,510
)
 
$
24.74

Nonvested restricted share awards at December 31, 2018
389,245

 
$
31.67
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
 
Restricted
Share Units
 
Weighted-Average
Grant-Date
Fair Value
Nonvested restricted share units at December 31, 2017
167,030

 
$
26.92

Granted
84,604

 
$
35.89

Vested
(72,437
)
 
$
26.86

Forfeited and other
(3,896
)
 
$
31.63

Nonvested restricted share units at December 31, 2018
175,301

 
$
31.17