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Share-Based Compensation and Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2017
Share-Based Compensation and Benefit Plans  
Summary of shares authorized and available for future issuance under compensation and benefit plans
 
 
December 31, 2017
Plans
 
Total Shares Authorized for Issuance under the Plans
 
Shares Available for Future Issuance under the Plans
Employee Incentive Plans
 
34,000

 
5,834

Director Stock Plan
 
1,000

 
263

Performance Incentive Plan
 
650

 
370

Employee Stock Purchase Plans
 
4,250

 
646

Profit Sharing and Savings Plan
 
4,200

 
349


Restricted stock [Member]  
Share-Based Compensation and Benefit Plans  
Summary of activity of share-based compensation and benefit plans
 
For the Year Ended 
 December 31,
 
2017
 
2016
 
2015
Compensation expense for restricted shares awarded
$
1,628

 
$
1,293

 
$
1,625

Income tax benefit from compensation expense related to restricted shares
$
621

 
$
483

 
$
610

Total fair value of restricted shares at vest date
$
1,202

 
$
2,384

 
$
3,284

Shares awarded under the plans
4

 
4

 
4

Weighted-average grant-date fair value of shares awarded under the plans
$
253.78

 
$
264.24

 
$
208.56


Employee stock purchase plan [Member]  
Share-Based Compensation and Benefit Plans  
Summary of ESPP plan activity
 
For the Year Ended 
 December 31,
 
2017
 
2016
 
2015
Compensation expense for shares issued under the ESPP
$
2,212

 
$
2,162

 
$
2,065

Income tax benefit from compensation expense for shares issued under the ESPP
$
844

 
$
807

 
$
773

Shares issued under the ESPP
64

 
54

 
60

Weighted-average price of shares issued under the ESPP
$
196.72

 
$
227.12

 
$
195.04


Employee [Member] | Restricted stock [Member]  
Share-Based Compensation and Benefit Plans  
Summary of restricted stock
 
Shares
 
Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2016
3

 
$
204.33

Granted during the period
1

 
256.69

Vested during the period (1)
(1
)
 
182.10

Forfeited during the period

 

Non-vested at December 31, 2017
3

 
$
244.06

(1) 
Includes less than one thousand shares withheld to cover employees’ taxes upon vesting.

Director [Member] | Restricted stock [Member]  
Share-Based Compensation and Benefit Plans  
Summary of restricted stock
 
Shares
 
Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2016
6

 
$
222.77

Granted during the period
3

 
252.45

Vested during the period
(4
)
 
200.81

Forfeited during the period

 

Non-vested at December 31, 2017
5

 
$
250.85


Stock option [Member]  
Share-Based Compensation and Benefit Plans  
Black-Scholes option pricing model
 
December 31,
 
2017
 
2016
 
2015
Risk free interest rate
1.98
%
 
1.44
%
 
1.52
%
Expected life
5.4 Years

 
5.5 Years

 
5.7 Years

Expected volatility
22.4
%
 
22.3
%
 
22.3
%
Expected dividend yield
%
 
%
 
%

Summary of activity of share-based compensation and benefit plans
 
For the Year Ended 
 December 31,
 
2017
 
2016
 
2015
Compensation expense for stock options awarded (in thousands)
$
15,561

 
$
15,404

 
$
18,209

Income tax benefit from compensation expense related to stock options (in thousands)
5,934

 
5,753

 
6,811

Total intrinsic value of stock options exercised (in thousands)
135,533

 
157,115

 
169,248

Cash received from exercise of stock options (in thousands)
33,229

 
47,394

 
105,822

Weighted-average grant-date fair value of options awarded
$
62.79

 
$
63.42

 
$
51.56

Weighted-average remaining contractual life of exercisable options
3.8 Years

 
3.9 Years

 
4.2 Years


Stock option [Member] | Employee stock option [Member]  
Share-Based Compensation and Benefit Plans  
Summary of stock options
 
Shares
(in thousands)
 
Weighted-Average Exercise Price
 
Average Remaining Contractual Terms
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 2016
2,789

 
$
105.11

 
 
 
 
Granted
282

 
251.26

 
 
 
 
Exercised
(674
)
 
48.58

 
 
 
 
Forfeited or expired
(33
)
 
215.46

 
 
 
 
Outstanding at December 31, 2017
2,364

 
$
137.08

 
5.3 Years
 
$
244,562

Vested or expected to vest at December 31, 2017
2,319

 
$
135.11

 
5.2 Years
 
$
244,492

Exercisable at December 31, 2017
1,571

 
$
85.00

 
3.8 Years
 
$
244,360


Stock option [Member] | Director [Member]  
Share-Based Compensation and Benefit Plans  
Summary of stock options
 
Shares
(in thousands)
 
Weighted-Average Exercise Price
 
Average Remaining Contractual Terms
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 2016
11

 
$
48.31

 
 
 
 
Granted

 

 
 
 
 
Exercised
(11
)
 
48.31

 
 
 
 
Forfeited

 

 
 
 
 
Outstanding at December 31, 2017

 
$

 

 
$

Vested or expected to vest at December 31, 2017

 
$

 

 
$

Exercisable at December 31, 2017

 
$

 

 
$