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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
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 |  |  | 355,384 |  | $ | 42.19
Granted |  |  | 160,245 |  |  | 42.31
Forfeited |  |  | (31,278) |  |  | 44.26
Nonvested share units at end of period |  |  | 484,351 |  |  | 42.34
Summary Of RSU Transactions |
|  |  | Number |  | Weighted
|  |  | of |  | Average
|  |  | Stock Units |  | Fair Value
Nonvested stock units at beginning of period |  |  | 193,687 |  | $ | 43.76
Granted |  |  | 71,376 |  |  | 45.10
Stock units vested and issued |  |  | (56,738) |  |  | 36.96
Forfeited |  |  | (12,177) |  |  | 44.91
Nonvested stock units at end of period |  |  | 196,148 |  |  | 46.18
Summary Of Stock Option Transactions |
|  |  |  | Weighted |  | Weighted |  |  |
|  |  |  | Average |  | Average |  | Aggregate
|  |  |  | Exercise |  | Remaining |  | Intrinsic
|  | Shares |  | Price |  | Life (years) |  | Value
Outstanding at beginning of period |  | 813,492 |  | $ | 35.37 |  |  |  |  |
Granted |  | 84,296 |  |  | 45.19 |  |  |  |  |
Forfeited |  | (3,695) |  |  | 43.03 |  |  |  |  |
Expired |  | (125) |  |  | 35.94 |  |  |  |  |
Exercised |  | (53,970) |  |  | 35.37 |  |  |  |  |
Outstanding at end of period |  | 839,998 |  | $ | 36.33 |  | 6.5 |  | $ | 4,554
Exercisable at end of period |  | 758,766 |  | $ | 35.38 |  | 6.1 |  | $ | 4,554
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,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation within operations and maintenance expenses |  | $ | 1,676 |  | $ | 1,285 |  | $ | 5,018 |  | $ | 4,216
Income tax benefit |  |  | 309 |  |  | 365 |  |  | 1,261 |  |  | 1,191
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,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation within operations and maintenance expenses |  | $ | 702 |  | $ | 724 |  | $ | 2,206 |  | $ | 2,089
Income tax benefit |  |  | 126 |  |  | 205 |  |  | 554 |  |  | 586
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,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation within operations and maintenance expenses |  | $ | 139 |  | $ | 94 |  | $ | 380 |  | $ | 395
Income tax benefit |  |  | 26 |  |  | 27 |  |  | 95 |  |  | 113
Assumptions Used In The Pricing Model |
| 2022
Expected term (years) |  | 5.48
Risk-free interest rate |  | 1.92%
Expected volatility |  | 26.5%
Dividend yield |  | 2.37%
Grant date fair value per option | $ | 9.34
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,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation within operations and maintenance expenses |  | $ | 13 |  | $ | 11 |  | $ | 38 |  | $ | 117
Income tax benefit |  |  | 4 |  |  | 3 |  |  | 11 |  |  | 34
Summary Of Restricted Stock Transactions |
|  | Number |  | Weighted
|  | of |  | Average
|  | Shares |  | Fair Value
Nonvested restricted stock at beginning of period |  | 1,068 |  | $ | 46.83
Granted |  | 1,170 |  |  | 42.75
Vested |  | (1,068) |  |  | (46.83)
Nonvested restricted stock at end of period |  | 1,170 |  | $ | 42.75
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,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation within operations and maintenance expenses |  | $ | 165 |  | $ | 175 |  | $ | 522 |  | $ | 525
Income tax benefit |  |  | 48 |  |  | 51 |  |  | 151 |  |  | 152
Summary Of Nonvested Share Activity |
|  | Number |  | Weighted
|  | of |  | Average
|  | Stock Awards |  | Fair Value
Nonvested stock awards at beginning of period |  | - |  | $ | -
Granted |  | 11,260 |  |  | 46.40
Vested |  | (11,260) |  |  | (46.40)
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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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