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Compensation Related Costs, Share Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity | The following tables set forth activity and various statistics for restricted stock unit awards outstanding under the respective plans for the period indicated:
|  | Number of Units |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2022 |  | 116,633 |  |  | $ | 79.32 |
Granted |  | 48,841 |  |  | $ | 81.79 |
Vested |  | (31,328) |  |  | $ | 90.94 |
Forfeited |  | (7,198) |  |  | $ | 77.65 |
Nonvested at December 31, 2023 |  | 126,948 |  |  | $ | 77.50 |
|  | 2023 |  | 2022 |  | 2021
Weighted-average grant date fair value (per share) |  | $ | 81.79 |  |  | $ | 76.96 |  |  | $ | 72.69 |
Fair value of shares granted (thousands of dollars) |  | $ | 3,995 |  |  | $ | 4,342 |  |  | $ | 3,660 |
Schedule of Nonvested Performance-Based Units Activity | The following tables set forth activity and various statistics related to our performance stock unit awards and the assumptions used by us in the valuations of the 2023, 2022 and 2021 grants at the grant date:
|  | Number of Units |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2022 |  | 214,537 |  |  | $ | 92.47 |
Granted |  | 95,474 |  |  | $ | 105.74 |
Vested |  | (50,188) |  |  | $ | 102.77 |
Forfeited |  | (12,497) |  |  | $ | 97.91 |
Nonvested at December 31, 2023 |  | 247,326 |  |  | $ | 95.23 |
|  | 2023 |  | 2022 |  | 2021
Volatility (a) |  | 29.20% |  | 34.00% |  | 32.70%
Dividend yield |  | 3.18% |  | 3.22% |  | 3.19%
Risk-free interest rate (b) |  | 4.37% |  | 1.65% |  | 0.20%
(a) - Volatility based on historical volatility over three years using daily stock price observations of our peer utilities. (b) - Using 3-year treasury rate.
|  | 2023 |  | 2022 |  | 2021
Weighted-average grant date fair value (per share) |  | $ | 105.74 |  |  | $ | 95.80 |  |  | $ | 82.51 |
Fair value of shares granted (thousands of dollars) |  | $ | 10,095 |  |  | $ | 8,360 |  |  | $ | 8,860 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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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