Revenue Recognition (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Consolidated	$ 514,907	$ 434,406	$ 1,298,533	$ 1,046,475
Regulated Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	273,612	250,481	520,839	478,179
Consolidated	273,636	251,505	520,558	479,859
Regulated Water [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	185,221	165,412	349,098	317,243
Regulated Water [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	52,033	45,796	97,510	87,533
Regulated Water [Member] \| Fire Protection [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,875	10,742	23,029	21,123
Regulated Water [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,187	8,638	19,238	16,780
Regulated Water [Member] \| Other Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	14,296	19,893	31,964	35,500
Regulated Water [Member] \| Alternative Revenue Program [Member]
Disaggregation of Revenue [Line Items]
Consolidated	24	1,024	(281)	1,680
Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	55,732	48,187	107,035	96,929
Consolidated	55,962	48,073	106,997	96,802
Wastewater [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	41,450	36,053	79,811	71,647
Wastewater [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,523	8,808	19,704	17,790
Wastewater [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	649	564	1,250	1,106
Wastewater [Member] \| Other Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,110	2,762	6,270	6,386
Wastewater [Member] \| Alternative Revenue Program [Member]
Disaggregation of Revenue [Line Items]
Consolidated	230	(114)	(38)	(127)
Regulated Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	172,608	128,203	644,593	451,383
Consolidated	177,321	128,188	648,118	452,519
Regulated Natural Gas [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	102,932	70,597	405,005	277,523
Regulated Natural Gas [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	20,186	14,408	81,537	56,579
Regulated Natural Gas [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	512	357	1,786	1,247
Regulated Natural Gas [Member] \| Gas Transportation & Storage [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	41,561	35,391	138,084	105,882
Regulated Natural Gas [Member] \| Other Utility [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7,417	7,450	18,181	10,152
Regulated Natural Gas [Member] \| Alternative Revenue Program [Member]
Disaggregation of Revenue [Line Items]
Consolidated	4,713	(15)	3,525	1,136
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,684	2,901	5,575	5,711
Consolidated	7,988	6,640	22,860	17,295
Other [Member] \| Other Utility [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,684	2,901	5,575	5,711
Other [Member] \| Other And Eliminations [Member]
Disaggregation of Revenue [Line Items]
Consolidated	$ 5,304	$ 3,739	$ 17,285	$ 11,584