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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based compensation expenses
 Total share-based compensation expenses were as follows (in thousands):
 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Option plan
$
23,876

 
$
26,191

 
$
24,428

Other share-based awards
23,368

 
23,275

 
26,574

Total share-based compensation before tax
47,244

 
49,466

 
51,002

Tax benefit
17,546

 
18,451

 
19,039

Total share-based compensation expense included in net income
$
29,698

 
$
31,015

 
$
31,963
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following summarizes stock option activity and the weighted average exercise price for the following plans for the each of the three years ended December 31, 2016, 2015 and 2014:
 
Omnibus Plan
(Active)
 
Option Plan
(Frozen)
 
Outstanding
Shares
 
Weighted
Average
Exercise
Price
 
Outstanding
Shares
 
Weighted
Average
Exercise
Price
Balance as of December 31, 2013
4,466,080

 
$
49.29

 
162,431

 
$
23.74

Granted
705,564

 
130.10

 
—

 
—

Exercised
(866,917
)
 
30.33

 
(96,398
)
 
23.77

Forfeited
(98,215
)
 
65.14

 
(2,800
)
 
22.43

Balance as of December 31, 2014
4,206,512

 
$
66.38

 
63,233

 
$
23.76

Granted
743,062

 
150.81

 
—

 
—

Exercised
(706,750
)
 
40.21

 
(44,283
)
 
23.92

Forfeited
(137,285
)
 
112.95

 
—

 
—

Balance as of December 31, 2015
4,105,539

 
$
84.61

 
18,950

 
$
23.37

Granted
1,326,430

 
78.72

 
—

 
—

Exercised
(348,206
)
 
40.51

 
(18,950
)
 
23.37

Forfeited
(366,702
)
 
108.90

 
—

 
—

Balance as of December 31, 2016
4,717,061

 
$
84.32

 
—

 
—

Vested or expected to vest as of December 31, 2016
4,717,061

 
$
84.32

 
—

 
—

Options exercisable as of December 31, 2016
2,199,084

 
$
62.60

 
—

 
—
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following assumptions were used to estimate the weighted average fair value of options of $16.81, $37.64 and $39.97 granted during the years ended December 31, 2016, 2015 and 2014, respectively:
 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Weighted-average volatility
32
%
 
32
%
 
40
%
Expected dividend yield
2.8
%
 
1.4
%
 
1.5
%
Expected term (in years)
4.5

 
4.5

 
4.5

Weighted average risk free interest rate
1.4
%
 
1.5
%
 
1.6
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes restricted stock activity for the year ended December 31, 2016:
 
Shares
Outstanding
 
Weighted
Average
Grant Price
Balance as of December 31, 2015
1,130,767

 
$
122.08

Granted
909,161

 
77.53

Vested
(233,841
)
 
89.72

Canceled/Forfeited
(284,885
)
 
108.08

Balance as of December 31, 2016
1,521,202

 
$
103.05

Expected to vest as of December 31, 2016
955,106

 
$
101.57