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Share-Based Compensation Level 3 (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [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
 
2019
 
2018
 
2017
Dividend yield
 
1.7%
 
1.8%
 
2.0%
Expected volatility
 
19.8%
 
18.5%
 
19.0%
Risk-free interest rate
 
2.5%
 
2.4%
 
1.6%
Expected holding period (years)
 
4.0
 
4.0
 
4.0
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
The following table summarizes certain information with respect to stock option and restricted share compensation included in our Consolidated Statement of Operations:
 
Years Ended December 31,
 
2019
 
2018
 
2017
 
(In thousands)
Total pretax employee share-based compensation expense included in net income
$
15,029

 
$
15,626

 
$
14,788

Income tax benefit related to share-based compensation included in net income
$
3,842

 
$
3,998

 
$
5,416
Share-based Payment Arrangement, Option, Activity [Table Text Block]
The following table sets forth stock option activity for the year ended December 31, 2019 (shares reported in whole numbers):
 
Options

 
Weighted-Average
Exercise Price

Outstanding at December 31, 2018
8,917,943

 
$
23.40

Granted
785,150

 
$
42.63

Exercised
(2,393,647
)
 
$
17.10

Outstanding at December 31, 2019
7,309,446

 
$
27.53

Exercisable at December 31, 2019
5,397,573

 
$
23.90
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, 2019 (shares reported in whole numbers):
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Price
 
Number
Outstanding at
December 31, 2019

 
Weighted-Average Remaining Contractual Life
(in years)
 
Weighted-
Average Exercise Price

 
Number
Exercisable at
December 31, 2019

 
Weighted-
Average Exercise Price

$10.00 — 20.00
 
1,239,011

 
1.8
 
$
16.77

 
1,239,011

 
$
16.77

$20.01 — 30.00
 
4,096,760

 
4.2
 
$
24.99

 
3,666,044

 
$
24.49

$30.01 — 40.00
 
1,188,525

 
6.1
 
$
37.50

 
492,518

 
$
37.50

$40.01 — 50.00
 
785,150

 
7.1
 
$
42.63

 
—

 
$
—

$0.00 — 50.00
 
7,309,446

 
4.4
 
$
27.53

 
5,397,573

 
$
23.90
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,
 
2019
 
2018
 
2017
Weighted average grant-date fair value of stock options granted
$
6.86

 
$
5.52

 
$
3.90

Total fair value of stock options vested
$
7,250

 
$
6,857

 
$
7,425

Total intrinsic value of stock options exercised
$
65,023

 
$
48,643

 
$
56,946

Cash received from the exercise of stock options
$
40,922

 
$
24,517

 
$
33,611

Recognized compensation expense
$
6,314

 
$
6,648

 
$
6,909
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Restricted share award activity was as follows (share awards reported in whole numbers):
 
Restricted
Share Awards

 
Weighted-Average
Grant-Date
Fair Value

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

 
$
31.67

Granted
125,546

 
$
42.73

Vested
(226,726
)
 
$
29.63

Nonvested restricted share awards at December 31, 2019
288,065

 
$
38.09
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
 
Restricted
Share Units

 
Weighted-Average
Grant-Date
Fair Value

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

 
$
31.17

Granted
72,067

 
$
40.91

Vested
(95,459
)
 
$
29.62

Forfeited and other
(457
)
 
$
27.94

Nonvested restricted share units at December 31, 2019
151,452

 
$
36.79