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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Market-Based Restricted Stock Awards, Valuation Assumptions | The weighted-average fair values of market-based restricted stock awards granted have been estimated utilizing the following assumptions:
| September 30, 2022 |  | September 30, 2021
Underlying stock price at valuation date | $ | 99.32 |  |  | $ | 113.27 |
Expected volatility | 36.7 | % |  | 30.3 | %
Risk-free interest rate | 1.8 | % |  | 1.3 | %
Restricted Stock and Restricted Stock Unit Award Activity | Restricted stock award activity for the nine months ended September 30, 2022 is set forth below:
| Shares |  | Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2022 | 383,963 |  |  | $ | 62.65 |
Granted | — |  |  | — |
Vested | (65,831) |  |  | $ | 80.89 |
Canceled | (1,605) |  |  | $ | 93.75 |
Nonvested at September 30, 2022 | 316,527 |  |  | $ | 60.11 |
Restricted stock unit activity for the nine months ended September 30, 2022 is set forth below:
| Number of Shares |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2022 | 360,743 |  |  |  |  |
Granted | 253,175 |  |  |  |  |
Vested | (74,604) |  |  |  |  |
Canceled | (12,658) |  |  |  |  |
Outstanding at September 30, 2022 | 526,656 |  |  | 2.6 |  | $ | 36,065,403 |
Vested and expected to vest at September 30, 2022 | 385,498 |  |  | 2.2 |  | $ | 26,398,925 |
Employee Stock Purchase Plan, Valuation Assumptions | The compensation expense related to the Purchase Plan has been estimated utilizing the following assumptions:
| September 30, 2022 |  | September 30, 2021
Risk-free interest rate | 1.54 | % |  | 0.06 | %
Expected term (in years) | 0.5 |  | 0.5
Dividend yield | 0.00 | % |  | 0.00 | %
Expected volatility | 41.6 | % |  | 35.62 | %
Weighted average volatility | 41.6 | % |  | 35.62 | %

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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