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Share-Based Compensation Level 3 (Tables)
 12 Months Ended
Dec. 31, 2017
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 for the years ended December 31:
Assumptions
 
2017
 
2016
 
2015
Dividend yield
 
2.0%
 
2.0%
 
1.8%
Expected volatility
 
19.0%
 
19.7%
 
23.3%
Risk-free interest rate
 
1.6%
 
1.0%
 
1.3%
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 for the years ended December 31:
 
2017
 
2016
 
2015
 
(In thousands)
Total pretax employee share-based compensation expense included in net income
$
14,788

 
$
14,056

 
$
13,843

Income tax benefit related to share-based compensation included in net income
$
5,416

 
$
6,427

 
$
5,068
Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table sets forth stock option activity for the year ended December 31, 2017:
(Shares reported in whole numbers)
 
Options
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2016
10,775,136

 
$
16.49

Granted
1,524,860

 
$
29.25

Exercised
(2,759,309
)
 
$
12.18

Canceled
(20,388
)
 
$
24.59

Outstanding at December 31, 2017
9,520,299

 
$
19.77

Exercisable at December 31, 2017
6,190,827

 
$
16.64
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, 2017:
(Shares reported in whole numbers)
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Price
 
Number
Outstanding at
December 31, 2017
 
Weighted-Average Remaining Contractual Life
(in years)
 
Weighted-
Average Exercise Price
 
Number
Exercisable at
December 31, 2017
 
Weighted-
Average Exercise Price
$ 5.00 — 10.00
 
725,074

 
1.1
 
$
9.09

 
725,074

 
$
9.09

$10.01 — 15.00
 
938,630

 
2.1
 
$
11.18

 
938,630

 
$
11.18

$15.01 — 20.00
 
2,757,306

 
3.7
 
$
16.56

 
2,757,306

 
$
16.56

$20.01 — 25.00
 
3,580,379

 
5.6
 
$
22.63

 
1,769,817

 
$
22.75

$25.01 — 30.00
 
1,518,910

 
7.1
 
$
29.25

 
—

 
$
—

$ 5.00 — 30.00
 
9,520,299

 
4.6
 
$
19.77

 
6,190,827

 
$
16.64
Other Information Pertaining to Stock Option Activity [Table Text Block]
Other information pertaining to stock option activity during the years ended December 31 is as follows:
 
2017
 
2016
 
2015
Weighted average grant-date fair value of stock options granted
$
3.90

 
$
4.01

 
$
3.79

Total fair value of stock options vested (in thousands)
$
7,425

 
$
7,690

 
$
7,973

Total intrinsic value of stock options exercised (in thousands)
$
56,946

 
$
37,284

 
$
52,513
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, 2016
500,744

 
$
21.48

Granted
208,933

 
$
29.28

Vested
(265,733
)
 
$
20.56

Forfeited and other
(2,133
)
 
$
25.04

Nonvested restricted share awards at December 31, 2017
441,811

 
$
25.70
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, 2016
123,510

 
$
25.72

Granted
95,780

 
$
27.94

Vested
(48,136
)
 
$
25.86

Forfeited and other
(4,124
)
 
$
27.01

Nonvested restricted share units at December 31, 2017
167,030

 
$
26.92