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The following table summarizes stock option information as of September 30, 2021 (Details)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Equity:  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance 713,210
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 52.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 9,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 62.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (39,220)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares $ 62.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (48,370)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares $ 35.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 634,620
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares $ 53.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 310,560
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares $ 44.53
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 610,935