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