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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Cumulative Repurchasing Activity by Plan
The following table summarizes by plan the Company’s repurchasing activity:
 
 
Cumulative shares
repurchased
 
Average price 
per share 
Non-Discretionary Plan (1994 through 2017)
 
37,356

 
$
32.63

Discretionary Plan (2001 through 2017)
 
62,252

 
$
41.90
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes information about RSU:
 
 
Number of
shares
 
Weighted average
grant date fair value
Outstanding at December 31, 2016
 
—

 
$
—

RSU granted
 
593

 
$
54.11

RSU vested
 
—

 
$
—

RSU forfeited
 
(12
)
 
$
54.04

Outstanding at December 31, 2017
 
581

 
$
54.11
Schedule of Stock Option Activity
The following table summarizes information about stock options: 
 
 
Number of
shares
 
Weighted
average
exercise price
per share
 
Weighted
average
remaining
contractual life
 
Aggregate 
intrinsic value
Outstanding at December 31, 2016
 
17,374

 
$
44.25

 
 
 
 
Options granted
 
—

 
$
—

 
 
 
 
Options exercised
 
(4,020
)
 
$
43.86

 
 
 
 
Options forfeited
 
(328
)
 
$
44.23

 
 
 
 
Options canceled
 
(65
)
 
$
46.27

 
 
 
 
Outstanding at December 31, 2017
 
12,961

 
$
44.36

 
5.78
 
$
263,431

Exercisable at December 31, 2017
 
6,615

 
$
43.44

 
4.30
 
$
140,569
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used
The fair value of each option grant is estimated on the date of grant using the Black-Scholes Model with the following assumptions:
 
 
For the years ended December 31,
 
 
2017
 
2016
 
2015
Dividend yield
 
1.50
%
 
1.70
%
 
1.60
%
Volatility – stock option plans
 
-

 
24 - 25%

 
29 - 34%

Volatility – stock purchase rights plans
 
14
%
 
20
%
 
20
%
Risk-free interest rates
 
1.22
%
 
0.51 - 1.42%

 
0.30 - 2.04%

Expected life (years) – stock option plans
 
-

 
5.5 - 6.5

 
6.41 - 7.47

Expected life (years) – stock purchase rights plans
 
1

 
1

 
1

Weighted average fair value of stock options granted during the period
 
-

 
$
9.57

 
$
13.44

Weighted average fair value of stock purchase rights granted during the period
 
$
11.69

 
$
10.99

 
$
10.45
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total stock compensation expense and the total related tax benefit recognized are as follows:
 
 
For the years ended December 31,
 
 
2017
 
2016
 
2015
Stock compensation expense
 
$
50,908

 
45,217

 
43,415

Recognized tax benefit
 
$
7,029

 
8,178

 
6,010