Summary Of Significant Accounting Policies (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 2,288,032	$ 1,878,144	$ 1,462,698
Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	902,873	832,769	804,684
Revenue	906,182	834,529	804,771
Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	165,383	132,580	120,794
Revenue	165,312	132,316	120,908
Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,142,997	859,368	506,440
Revenue	1,143,362	859,902	506,564
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,478	13,358	12,861
Revenue	73,176	51,397	30,455
Other [Member] | Other And Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenue	61,698	38,039	17,594
Residential [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	607,473	561,996	567,486
Residential [Member] | Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	122,612	99,931	95,051
Residential [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	720,490	530,338	314,274
Commercial [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	168,460	151,071	143,479
Commercial [Member] | Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	30,340	22,060	19,062
Commercial [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	149,653	99,596	50,239
Fire Protection [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	38,970	35,984	35,340
Industrial [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	32,581	30,230	29,764
Industrial [Member] | Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,755	1,729	1,619
Industrial [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,636	3,427	6,923
Gas Transportation [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	205,825	198,195	133,685
Other Water [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	55,389	53,488	32,372
Other Wastewater [Member] | Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,676	8,860	5,385
Customer Rate Credits [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers			(3,757)
Customer Rate Credits [Member] | Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers			(323)
Customer Rate Credits [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		(5,000)	(18,924)
Other Utility [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	61,393	32,812	20,243
Other Utility [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,478	13,358	12,861
Alternative Revenue Program [Member] | Water [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,309	1,760	87
Alternative Revenue Program [Member] | Wastewater [Member]
Disaggregation of Revenue [Line Items]
Revenue	(71)	(264)	114
Alternative Revenue Program [Member] | Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 365	$ 534	$ 124