Taxes Other Than Income Taxes (Components Of Taxes Other Than Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 20,348	$ 21,720	$ 43,226	$ 44,727
Property [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	8,431	8,239	16,535	16,253
Gross Receipts, Excise And Franchise [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	4,175	4,017	8,205	8,117
Payroll [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	4,935	4,778	11,567	11,439
Regulatory Assessments [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	1,715	1,812	3,398	3,577
Pumping Fees [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	181	1,947	1,647	3,323
Other [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 911	$ 927	$ 1,874	$ 2,018