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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Equity-Based Compensation Plans with Grants Outstanding | The following table provides a summary of each of our equity-based compensation plans with grants outstanding at December 31, 2021. Each of the following plans was approved by our shareholders:
Equity-Based Compensation Plans |  | Shares Authorized |  | Options/RSUs Outstanding |  | Shares Available to Issue
2010 Equity Incentive Plan (1) |  | 700,000 |  |  | 76,903 |  |  | — |
2014 Equity Incentive Plan (2) |  | 950,000 |  |  | 354,876 |  |  | 110,942 |
2018 Equity Incentive Plan (3) |  | 275,000 |  |  | 119,480 |  |  | 155,270 |
(1)The 2010 Equity Incentive Plan (the “2010 Plan”) authorizes us to issue Options and RSUs. There were 63,869 Options and 13,034 RSUs outstanding as of December 31, 2021. Shares can no longer be granted from this plan. (2)The 2014 Equity Incentive Plan (the “2014 Plan”) authorizes us to issue Options only. (3)The 2018 Equity Incentive Plan (the "2018 Plan") authorizes us to issue Options and RSUs. Of the 275,000 aggregate shares authorized to issue, all may be granted in the form of Options and up to 40,000 may be granted in the form of RSUs. There were 115,950 Options and 3,530 RSUs outstanding as of December 31, 2021. Of the 155,270 shares available to issue, 36,470 may be granted in the form of RSUs.
Equity-Based Compensation Plans | The following table provides additional information relative to our equity-based compensation plans for the year ended December 31, 2021:
|  | Shares |  | Weighted Avg. Per Share Exercise Price |  | Weighted Avg. Remaining Contract Life (years) |  | Aggregate Intrinsic Value
Stock Options |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  | 593,426 |  |  | $ | 2,295.11 |  |  |  |  |
Granted |  | 18,912 |  |  | 4,719.80 |  |  |  |  |
Exercised |  | (73,749) |  |  | 1,933.30 |  |  |  |  |
Forfeited |  | (3,894) |  |  | 3,140.57 |  |  |  |  |
Outstanding at December 31, 2021 |  | 534,695 |  |  | $ | 2,424.62 |  |  | 5.3 |  | $ | 1,863,010 |
Exercisable at December 31, 2021 |  | 334,634 |  |  | $ | 1,993.07 |  |  | 4.3 |  | $ | 1,310,360 |
RSUs |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  | 17,598 |  |  |  |  |  |  |
Granted |  | 50 |  |  |  |  |  |  |
Vested |  | (278) |  |  |  |  |  |  |
Forfeited |  | (806) |  |  |  |  |  |  |
Outstanding at December 31, 2021 |  | 16,564 |  |  |  |  |  |  | $ | 97,875 |
Vested, but not issued at December 31, 2021 |  | — |  |  |  |  |  |  | $ | — |
Black-Scholes Option-Pricing Model Assumptions | The fair value of the Options granted during 2021, 2020 and 2019 was estimated on the grant date using the Pricing Model, based on the following assumptions:
|  | 2021 |  | 2020 |  | 2019
Estimated option life (years) |  | 5.31 |  | 5.36 |  | 5.55
Risk free interest rate (range) |  | 0.30%-1.55% |  | 0.22%-1.94% |  | 1.51%-2.73%
Expected volatility (range) |  | 24.46%-30.80% |  | 18.78%-32.48% |  | 19.17%-22.01%
Expected dividend rate |  | — | % |  | — | % |  | — | %
Weighted average grant-date fair value per share of options granted |  | $ | 1,235.91 |  |  | $ | 737.19 |  |  | $ | 661.01 |
Exercised Option Proceeds | Information with respect to the vested RSUs and exercised Options is as follows:
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Aggregate exercise proceeds |  | $ | 142,370 |  |  | $ | 180,866 |  |  | $ | 274,028 |
Aggregate intrinsic value on exercise dates |  | $ | 219,219 |  |  | $ | 432,772 |  |  | $ | 593,162 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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