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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of information with respect to stock options granted
Information with respect to stock options granted under the 2009 and 1994 Plans is as follows:

 
2009 Plan
shares
 
Weighted
average
exercise price
per share
 
1994 Plan
shares
 
Weighted
average
exercise price
per share
Options Outstanding, December 31, 2014
340,062

 
$
122.67

 
272,402

 
$
104.96

Exercised
(90,884
)
 
124.01

 
(190,207
)
 
105.70

Granted
—

 
—

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Options Outstanding, December 31, 2015
249,178

 
$
122.17

 
82,195

 
$
103.27

Exercised
(71,845
)
 
117.04

 
(59,654
)
 
112.85

Granted
—

 
—

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Options Outstanding, December 31, 2016
177,333

 
$
124.25

 
22,541

 
$
77.91

Exercised
(27,360
)
 
110.47

 
(14,763
)
 
93.35

Granted
—

 
—

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Options Outstanding, December 31, 2017 (1)
149,973

 
$
126.77

 
7,778

 
$
48.60

Options Exercisable:
 

 
 

 
 

 
 

December 31, 2015
188,081

 
$
119.98

 
82,195

 
$
103.27

December 31, 2016
177,333

 
$
124.25

 
22,541

 
$
77.91

December 31, 2017
149,973

 
$
126.77

 
7,778

 
$
48.60
Summary of exercise prices and contractual lives of options outstanding
The following summarizes the exercise prices and contractual lives of options outstanding as of December 31, 2017:

2009 Plan
Number of Options
 
Range—Exercise Price
 
Weighted Average
Remaining Contractual Term
(in years)
5,158
 
$70.00
-
 
$79.99
 
2.1
15,762
 
$110.00
-
 
$119.99
 
3.1
29,862
 
$120.00
-
 
$129.99
 
5.2
99,191
 
$130.00
-
 
$139.99
 
4.6
149,973
 
 
 
 
 
 
 

1994 Plan
Number of Options
 
Range—Exercise Price
 
Weighted Average
Remaining Contractual Term
(in years)
7,778
 
$40.00
-
 
$49.99
 
1.1
Schedule of nonvested performance awards granted
Information with respect to performance awards granted is as follows:

 
 
Performance awards
 
Weighted average grant date fair value per award
Outstanding at December 31, 2014
 
239,902

 
$
95.20

  Granted (1)
 
85,636

 
148.49

  Change in awards based on performance (2)
 
14,697

 
78.50

  Converted to restricted stock
 
(95,826
)
 
78.50

  Forfeited
 
(6,143
)
 
110.34

Outstanding at December 31, 2015
 
238,266

 
$
119.65

  Granted (3)
 
94,054

 
141.92

  Change in awards based on performance (2)
 
36,091

 
101.52

  Converted to restricted stock
 
(115,618
)
 
94.67

  Forfeited
 
(1,630
)
 
141.98

Outstanding at December 31, 2016
 
251,163

 
$
136.74

  Granted (4)
 
81,708

 
176.59

  Change in awards based on performance (2)
 
49,323

 
119.26

  Converted to restricted stock
 
(128,482
)
 
118.75

  Forfeited
 
(1,942
)
 
159.39

Outstanding at December 31, 2017
 
251,770

 
$
155.25

_________________________________
(1)
The amount of restricted stock that ultimately may be earned is based on the total shareholder return metrics related to the Company’s common stock for 55,162 performance awards and financial metrics related to operating performance and leverage metrics of the Company for 30,474 performance awards.
(2)
Represents the change in the number of performance awards earned based on performance achievement for the performance period.
(3)
The amount of restricted stock that ultimately may be earned is based on the total shareholder return metrics related to the Company’s common stock for 61,039 performance awards and financial metrics related to operating performance and leverage metrics of the Company for 33,015 performance awards.
(4)
The amount of restricted stock that ultimately may be earned is based on the total shareholder return metrics related to the Company’s common stock for 49,374 performance awards and financial metrics related to operating performance and leverage metrics of the Company for 32,334 performance awards.
Schedule of restricted stock granted
Information with respect to restricted stock granted is as follows:

 
 
Restricted stock shares
 
Restricted stock shares weighted average grant date fair value per share
 
Restricted stock shares converted from performance awards
Outstanding at December 31, 2014
 
179,307

 
$
129.06

 
10,933

  Granted - restricted stock shares
 
61,953

 
173.04

 
95,826

  Vested - restricted stock shares
 
(91,847
)
 
130.75

 
(8,412
)
  Forfeited
 
(1,529
)
 
151.86

 
—

Outstanding at December 31, 2015
 
147,884

 
$
146.21

 
98,347

  Granted - restricted stock shares
 
81,400

 
162.38

 
115,618

  Vested - restricted stock shares
 
(88,712
)
 
141.38

 
(36,872
)
  Forfeited
 
(3,867
)
 
162.43

 
(395
)
Outstanding at December 31, 2016
 
136,705

 
$
158.51

 
176,698

  Granted - restricted stock shares
 
73,342

 
179.58

 
128,482

  Vested - restricted stock shares
 
(73,683
)
 
153.86

 
(70,595
)
  Forfeited
 
(2,731
)
 
173.42

 
(657
)
Outstanding at December 31, 2017
 
133,633

 
$
172.33

 
233,928
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of valuation options
There were no stock options granted in 2017, 2016 and 2015.
Performance awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of valuation options
The Company used a Monte Carlo model to assess the compensation cost associated with the portion of the performance awards granted for which achievement will be determined by using total shareholder return measures. The assumptions used are as follows:

 
 
2017
 
2016
 
2015
Dividend yield
 
3.2%
 
3.3%
 
3.0%
Estimated volatility over the life of the plan (1)
 
15.3% - 19.7%
 
15.2% - 22.8%
 
12.0% - 17.3%
Risk free rate
 
0.69% - 1.61%
 
0.44% - 0.88%
 
0.07% - 1.09%
Estimated performance award value based on total shareholder return measure
 
$175.86
 
$131.24
 
$139.18
_________________________________
(1)
Estimated volatility of the life of the plan is using 50% historical volatility and 50% implied volatility.