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STOCK-BASED COMPENSATION PLANS (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock Option Activity
The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and Directors Plan for the years ended December 31: 
OptionsWeighted
Average
Exercise
Price
Weighted Average
Remaining
Contractual Life
Aggregate
Intrinsic value
(in millions)
Outstanding at December 31, 2018466,677 $61.04 5.7$
Granted134,450 $70.44  $
Exercised(4,868)$22.45  — 
Canceled(8,235)$73.00  — 
Outstanding at December 31, 2019588,024 $63.36 5.7$
Granted136,506 $77.75  — 
Exercised(86,145)$35.47  — 
Canceled(85,716)$73.73  — 
Outstanding at December 31, 2020552,669 $69.82 6.1$
Granted126,794 $81.21  — 
Exercised(113,728)$50.38  — 
Canceled(33,820)$73.53  — 
Outstanding at December 31, 2021531,915 $75.40 6.5$
Exercisable at December 31, 2021308,591 $73.39 6.1$
Stock Options Outstanding
Options outstanding at December 31, 2021 were as follows:
 
Range of exercise pricesNumber of
Options
Outstanding
Weighted
Average
Exercise
Price of
Options
Outstanding
Weighted
Average
Remaining
Contractual
Life
Number of
Options
Currently
Exercisable
Weighted Average
Exercise Price of
Options Currently
Exercisable
35.00 - 50.00
35,002 $47.80 1.135,002 $47.80 
50.00 - 65.00
40,317 $59.09 4.637,217 $60.52 
65.00 - 80.00
248,483 $74.43 6.9143,862 $73.37 
Over 80.00
208,113 $84.36 7.392,510 $88.28 
 531,915 $75.40 6.5308,591 $73.39 
Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
For the year ended
December 31,
 202120202019
Dividend yield0.60 %0.60 %0.66 %
Risk-free interest rate0.8 %1.5 %2.6 %
Stock price volatility36.1 %28.1 %25.8 %
Expected life (years)5.05.05.0
Weighted average fair value of options granted during the year$25.01 $21.05 $19.54 
Restricted Stock Activity and Incentive Stock Awards Activity The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan, and Directors Plan, and incentive stock units activity and related information for the 2011 Plan and the 2000 Plan with related information for the years ended December 31:
Restricted
Stock
and Units
Incentive
Stock
Awards
Weighted
Average Grant
Date Fair
Value
Outstanding at December 31, 2018445,089 415,242 $75.51 
Granted608,813 259,950 $70.61 
Vested(235,406)(119,835)$71.65 
Adjustment for incentive stock awards expected to vest— 80,403 $78.04 
Canceled(27,465)(63,758)$74.04 
Outstanding at December 31, 2019791,031 572,002 $73.64 
Granted283,587 250,197 $75.68 
Vested(345,859)(147,069)$77.45 
Adjustment for incentive stock awards expected to vest— (331,004)$71.32 
Canceled(72,753)(73,481)$72.83 
Outstanding at December 31, 2020656,006 270,645 $73.80 
Granted235,902 241,467 $81.64 
Vested(350,955)(37,672)$71.82 
Adjustment for incentive stock awards expected to vest— 180,767 $76.26 
Canceled(33,255)(48,106)$76.24 
Outstanding at December 31, 2021507,698 607,101 $78.06