Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Commitments And Contingencies [Line Items]
Estimated annual commitments to purchase water through the next five years	$ 3,419
Aggregate amount of the commitments for the remaining years	$ 1,120
Purchase Obligation Term	20 years
Amount probable of recovery through insurance	$ 1,530
Contingent liability for self-insured employee medical benefit program	2,327	$ 2,470
Recorded Unconditional Purchase Obligation Due after Fifth Year	1,708
Loss Contingency Accrual	19,658
Public Utilities, Inventory, Fuel [Member]
Commitments And Contingencies [Line Items]
Estimated commitments through 2027	241,248
Recorded Unconditional Purchase Obligation Due after Fifth Year	$ 1,606,927
Water And Wastewater Utility Systems [Member] | Pennsylvania [Member]
Commitments And Contingencies [Line Items]
Customer rate credits		4,080
Natural Gas Utility [Member] | Pennsylvania [Member]
Commitments And Contingencies [Line Items]
Customer rate credits		$ 18,924
Peoples Gas Acquisition [Member]
Commitments And Contingencies [Line Items]
Pipeline term	7 years
Pipeline cost	$ 120,000
Customer rate credits	$ 23,004
Peoples Gas Acquisition [Member] | Pennsylvania [Member]
Commitments And Contingencies [Line Items]
Pipeline term	7 years
Pipeline cost	$ 120,000
Customer rate credits	$ 23,004