Revenue Recognition (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Consolidated	$ 530,854	$ 514,907	$ 1,392,613	$ 1,298,533
Regulated Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	290,645	273,612	553,808	520,839
Consolidated	291,290	273,636	554,360	520,558
Regulated Water [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	200,006	185,221	378,246	349,098
Regulated Water [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	55,362	52,033	104,636	97,510
Regulated Water [Member] \| Fire Protection [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,974	11,875	23,533	23,029
Regulated Water [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,609	10,187	20,426	19,238
Regulated Water [Member] \| Other Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	12,694	14,296	26,967	31,964
Regulated Water [Member] \| Alternative Revenue Program [Member]
Disaggregation of Revenue [Line Items]
Consolidated	645	24	552	(281)
Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	62,502	55,732	120,062	107,035
Consolidated	63,076	55,962	120,188	106,997
Wastewater [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	47,295	41,450	90,118	79,811
Wastewater [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	12,065	10,523	22,728	19,704
Wastewater [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	582	649	1,381	1,250
Wastewater [Member] \| Other Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,560	3,110	5,835	6,270
Wastewater [Member] \| Alternative Revenue Program [Member]
Disaggregation of Revenue [Line Items]
Consolidated	574	230	126	(38)
Regulated Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	164,995	172,608	700,629	644,593
Consolidated	169,279	177,321	698,691	648,118
Regulated Natural Gas [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	94,255	102,932	450,380	405,005
Regulated Natural Gas [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18,655	20,186	95,707	81,537
Regulated Natural Gas [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	416	512	2,259	1,786
Regulated Natural Gas [Member] \| Gas Transportation & Storage [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	42,170	41,561	142,781	138,084
Regulated Natural Gas [Member] \| Other Utility [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9,499	7,417	9,502	18,181
Regulated Natural Gas [Member] \| Alternative Revenue Program [Member]
Disaggregation of Revenue [Line Items]
Consolidated	4,284	4,713	(1,938)	3,525
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,178	2,684	5,971	5,575
Consolidated	7,209	7,988	19,374	22,860
Other [Member] \| Other Utility [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,178	2,684	5,971	5,575
Other [Member] \| Other And Eliminations [Member]
Disaggregation of Revenue [Line Items]
Consolidated	$ 4,031	$ 5,304	$ 13,403	$ 17,285