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Share-Based Compensation Level 3 (Tables)
 12 Months Ended
Dec. 31, 2016
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
 
2016
 
2015
 
2014
Dividend yield
 
2.0
%
 
1.8
%
 
1.8
%
Expected volatility
 
19.7
%
 
23.3
%
 
27.1
%
Risk-free interest rate
 
1.0
%
 
1.3
%
 
1.1
%
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:
 
2016
 
2015
 
2014
 
(In thousands)
Total pretax employee share-based compensation expense included in net income
$
14,056

 
$
13,843

 
$
13,127

Income tax benefit related to share-based compensation included in net income
$
6,427

 
$
5,068

 
$
7,368
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table sets forth stock option activity for the year ended December 31, 2016:
(Shares reported in whole numbers)
 
Options
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2015
11,047,920

 
$
13.98

Granted
1,863,700

 
$
22.28

Exercised
(2,108,212
)
 
$
8.38

Canceled
(28,272
)
 
$
20.98

Outstanding at December 31, 2016
10,775,136

 
$
16.49

Exercisable at December 31, 2016
6,938,591

 
$
13.69
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, 2016:
(Shares reported in whole numbers)
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Price
 
Number
Outstanding at
December 31, 2016
 
Weighted-Average Remaining Contractual Life
(in years)
 
Weighted-
Average Exercise Price
 
Number
Exercisable at
December 31, 2016
 
Weighted-
Average Exercise Price
$ 5.00 — 10.00
 
2,032,763

 
1.7
 
$
8.42

 
2,032,763

 
$
8.42

$10.01 — 15.00
 
1,361,450

 
3.1
 
$
11.18

 
1,361,450

 
$
11.18

$15.01 — 20.00
 
3,548,915

 
4.7
 
$
16.50

 
2,801,293

 
$
16.26

$20.01 — 25.00
 
3,832,008

 
6.6
 
$
22.65

 
743,085

 
$
22.97

$ 5.00 — 25.00
 
10,775,136

 
4.6
 
$
16.49

 
6,938,591

 
$
13.69
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:
 
2016
 
2015
 
2014
Weighted average grant-date fair value of stock options granted
$
4.01

 
$
3.79

 
$
3.34

Total fair value of stock options vested (in thousands)
$
7,690

 
$
7,973

 
$
6,814

Total intrinsic value of stock options exercised (in thousands)
$
37,284

 
$
52,513

 
$
42,048
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, 2015
573,739

 
$
19.32

Granted
241,510

 
$
22.28

Vested
(313,247
)
 
$
18.14

Forfeited and other
(1,258
)
 
$
20.85

Nonvested restricted share awards at December 31, 2016
500,744

 
$
21.48
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, 2015
—

 
$
—

Granted
130,660

 
$
25.72

Vested
(1,950
)
 
$
25.72

Forfeited and other
(5,200
)
 
$
25.72

Nonvested restricted share units at December 31, 2016
123,510

 
$
25.72