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Revenue Recognition (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated | $ 476,971 | $ 435,255 | $ 1,775,504 | $ 1,481,730
Regulated Water [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 301,636 | 279,241 | 822,475 | 757,420
Consolidated | 302,052 | 280,023 | 822,610 | 759,882
Regulated Water [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 201,815 | 182,616 | 550,913 | 499,859
Regulated Water [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 59,786 | 52,577 | 157,296 | 140,110
Regulated Water [Member] | Fire Protection [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,210 | 10,670 | 35,239 | 31,793
Regulated Water [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,695 | 9,747 | 30,933 | 26,527
Regulated Water [Member] | Other Water [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,130 | 23,631 | 48,094 | 59,131
Regulated Water [Member] | Alternative Revenue Program [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated | 416 | 782 | 135 | 2,462
Wastewater [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 58,523 | 51,722 | 165,558 | 148,651
Consolidated | 59,318 | 51,777 | 166,315 | 148,579
Wastewater [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 42,999 | 37,450 | 122,810 | 109,097
Wastewater [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,062 | 9,779 | 30,766 | 27,569
Wastewater [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 610 | 1,043 | 1,860 | 2,149
Wastewater [Member] | Other Wastewater [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,852 | 3,450 | 10,122 | 9,836
Wastewater [Member] | Alternative Revenue Program [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated | 795 | 55 | 757 | (72)
Regulated Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 107,933 | 96,374 | 752,526 | 547,757
Consolidated | 108,450 | 96,731 | 756,568 | 549,250
Regulated Natural Gas [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 58,993 | 49,398 | 463,998 | 326,921
Regulated Natural Gas [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,003 | 9,838 | 93,540 | 66,417
Regulated Natural Gas [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 227 | 228 | 2,013 | 1,475
Regulated Natural Gas [Member] | Gas Transportation & Storage [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 30,067 | 27,576 | 168,151 | 133,458
Regulated Natural Gas [Member] | Other Utility [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,643 | 9,334 | 24,824 | 19,486
Regulated Natural Gas [Member] | Alternative Revenue Program [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated | 517 | 357 | 4,042 | 1,493
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,685 | 2,677 | 8,260 | 8,389
Consolidated | 7,151 | 6,724 | 30,011 | 24,019
Other [Member] | Other Utility [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,685 | 2,677 | 8,260 | 8,389
Other [Member] | Other And Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated | $ 4,466 | $ 4,047 | $ 21,751 | $ 15,630

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