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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of information with respect to stock options granted
Information with respect to stock options granted under the 2009 Plan is as follows:
 2009 Plan
shares		Weighted
average
exercise price
per share
Options Outstanding, December 31, 2018124,212 $128.84 
Exercised(109,804)129.47 
Granted— — 
Forfeited— — 
Options Outstanding, December 31, 201914,408 $124.05 
Exercised(1,902)89.17 
Granted — — 
Forfeited— — 
Options Outstanding, December 31, 202012,506 $129.35 
Exercised(2,759)124.34 
Granted (1)294,115 180.32 
Forfeited(4,713)180.32 
Options Outstanding, December 31, 2021299,149 $178.71 
Options Exercisable:  
December 31, 201914,408 $124.05 
December 31, 202012,506 $129.35 
December 31, 20219,747 $130.77 
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(1)Includes 4,847 options resulting from recipient elections to receive a portion of earned restricted stock awards in the form of stock options.
Summary of valuation options The assumptions used are as follows:
2021
Dividend yield3.5 %
Estimated volatility27.1 %
Risk free rate0.81 %
Expected life of options
5 years
Estimated fair value$28.64
The assumptions used are as follows:
202120202019
Dividend yield3.5%2.8%3.1%
Estimated volatility over the life of the plan (1)
22.0% - 49.0%
11.1% - 15.5%
13.9% - 18.8%
Risk free rate
0.06% - 0.38%
1.45% - 1.62%
2.46% - 2.57%
Estimated performance award value based on total shareholder return measure$213.16$254.72$204.15
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(1)     Estimated volatility over the life of the plan is using 50% historical volatility and 50% implied volatility.
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, 2021:
2009 Plan
Number of Options		Range—Exercise PriceWeighted Average
Remaining Contractual Term
(in years)
9,747$130.00-$139.990.9
289,402$180.00-$189.999.2
299,149  
Schedule of nonvested performance awards granted Information with respect to performance awards granted is as follows:
Performance awardsWeighted average grant date fair value per award
Outstanding at December 31, 2018267,129 $157.21 
  Granted (1)80,512 200.75 
  Change in awards based on performance (2)(16,760)142.03 
  Converted to restricted stock(73,072)142.03 
  Forfeited(4,377)166.44 
Outstanding at December 31, 2019253,432 $176.27 
  Granted (3)77,182 238.03 
  Change in awards based on performance (2)18,112 177.26 
  Converted to restricted stock(96,317)177.26 
  Forfeited(10,488)188.52 
Outstanding at December 31, 2020241,921 $195.13 
  Granted (4)138,033 191.12 
  Change in awards based on performance (2)(37,469)156.00 
  Converted to shares of common stock(56,545)156.00 
  Forfeited(1,418)207.65 
Outstanding at December 31, 2021284,522 $206.05 
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(1)     The shares of common stock earned was based on the total shareholder return metrics for the Company’s common stock for 47,502 performance awards and financial metrics related to operating performance, net asset value and leverage metrics of the Company for 33,010 performance awards.
(2)    Represents the change in the number of performance awards earned based on performance achievement.
(3)    The shares of common stock that may be earned is based on the total shareholder return metrics for the Company’s common stock for 38,823 performance awards and financial metrics related to operating performance and leverage metrics of the Company for 38,359 performance awards.
(4)    The shares of common stock that may be earned is based on the total shareholder return metrics for the Company’s common stock for 69,064 performance awards and financial metrics related to operating performance and leverage metrics of the Company for 68,969 performance awards.
Schedule of restricted stock granted Information with respect to restricted stock granted is as follows:
Restricted stock sharesRestricted stock shares weighted average grant date fair value per shareRestricted stock shares converted from performance awards
Outstanding at December 31, 2018160,411 $166.33 209,238 
  Granted - restricted stock shares79,430 196.43 73,072 
  Vested - restricted stock shares(89,289)168.06 (119,064)
  Forfeited(2,226)174.45 (135)
Outstanding at December 31, 2019148,326 $181.29 163,111 
  Granted - restricted stock shares69,228 221.08 96,317 
  Vested - restricted stock shares(79,931)178.41 (111,325)
  Forfeited(5,899)196.22 (1,784)
Outstanding at December 31, 2020131,724 $203.28 146,319 
  Granted - restricted stock shares99,291 178.84 — 
  Vested - restricted stock shares(69,840)192.32 (71,692)
  Forfeited(4,109)195.77 — 
Outstanding at December 31, 2021157,066 $192.90 74,627