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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of PSU Transactions |
|  |  | Number |  | Weighted
|  |  | of |  | Average
|  |  | Share Units |  | Fair Value
Nonvested share units at beginning of period |  |  | 531,437 |  | $ | 40.03
Granted |  |  | 227,284 |  |  | 38.10
Performance criteria adjustment |  |  | (155,959) |  |  | 31.50
Share units issued |  |  | (96,425) |  |  | 43.40
Forfeited |  |  | (46,419) |  |  | 41.23
Nonvested share units at end of period |  |  | 459,918 |  |  | 41.14
Summary Of RSU Transactions |
|  |  | Number |  | Weighted
|  |  | of |  | Average
|  |  | Stock Units |  | Fair Value
Nonvested stock units at beginning of period |  |  | 192,217 |  | $ | 45.06
Granted |  |  | 104,661 |  |  | 36.61
Stock units vested and issued |  |  | (65,625) |  |  | 44.42
Forfeited |  |  | (19,828) |  |  | 41.36
Nonvested stock units at end of period |  |  | 211,425 |  |  | 41.40
Assumptions Used In The Pricing Model |
| 2024 | 2023 |
Expected term (years) |  | 5.5 |  | 5.5 |
Risk-free interest rate |  | 4.00% |  | 4.03% |
Expected volatility |  | 28.30% |  | 27.80% |
Dividend yield |  | 3.43% |  | 2.53% |
Grant date fair value per option | $ | 8.12 | $ | 11.37 |
Summary Of Stock Option Transactions |
|  |  |  | Weighted |  | Weighted |  |  |
|  |  |  | Average |  | Average |  | Aggregate
|  |  |  | Exercise |  | Remaining |  | Intrinsic
|  | Shares |  | Price |  | Life (years) |  | Value
Outstanding at beginning of period |  | 882,442 |  | $ | 37.03 |  |  |  |  |
Granted |  | 119,548 |  |  | 35.78 |  |  |  |  |
Forfeited |  | (17,917) |  |  | 39.27 |  |  |  |  |
Expired |  | (7,103) |  |  | 44.57 |  |  |  |  |
Exercised |  | (15,383) |  |  | 34.94 |  |  |  |  |
Outstanding at end of period |  | 961,587 |  | $ | 36.81 |  | 5.2 |  | $ | 2,598
Exercisable at end of period |  | 786,865 |  | $ | 36.24 |  | 4.5 |  | $ | 2,296
Summary Of Restricted Stock Transactions |
|  | Number |  | Weighted
|  | of |  | Average
|  | Shares |  | Fair Value
Nonvested restricted stock at beginning of period |  | 1,412 |  | $ | 35.42
Granted |  | - |  |  | -
Vested |  | - |  |  | -
Nonvested restricted stock at end of period |  | 1,412 |  | $ | 35.42
Performance Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Compensation Costs |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation within operations and maintenance expenses |  | $ | 986 |  | $ | 1,039 |  | $ | 2,174 |  | $ | 5,444
Income tax benefit |  |  | 248 |  |  | 260 |  |  | 545 |  |  | 1,364
Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Compensation Costs |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation within operations and maintenance expenses |  | $ | 508 |  | $ | 746 |  | $ | 2,078 |  | $ | 2,186
Income tax benefit |  |  | 128 |  |  | 187 |  |  | 521 |  |  | 548
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Compensation Costs |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation within operations and maintenance expenses |  | $ | 32 |  | $ | 181 |  | $ | 233 |  | $ | 480
Income tax benefit |  |  | 8 |  |  | 45 |  |  | 58 |  |  | 120
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Compensation Costs |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation within operations and maintenance expenses |  | $ | 13 |  | $ | 12 |  | $ | 37 |  | $ | 37
Income tax benefit |  |  | 3 |  |  | 3 |  |  | 10 |  |  | 10
Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Compensation Costs |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation within operations and maintenance expenses |  | $ | - |  | $ | - |  | $ | 840 |  | $ | 780
Income tax benefit |  |  | - |  |  | - |  |  | 233 |  |  | 219
Summary Of Nonvested Share Activity |
|  | Number |  | Weighted
|  | of |  | Average
|  | Stock Awards |  | Fair Value
Nonvested stock awards at beginning of period |  | - |  | $ | -
Granted |  | 22,813 |  |  | 36.82
Vested |  | (22,813) |  |  | 36.82
Nonvested stock awards at end of period |  | - |  |  | -

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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