Taxes Other Than Income Taxes (Components Of Taxes Other Than Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 24,207	$ 22,625	$ 67,433	$ 67,352
Property [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	7,402	8,545	23,937	24,798
Gross Receipts, Excise And Franchise [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	5,456	4,371	13,661	12,484
Payroll [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	4,901	4,695	16,468	16,133
Regulatory Assessments [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	2,146	1,486	5,544	5,063
Pumping Fees [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	3,320	2,824	4,967	6,147
Other [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 982	$ 704	$ 2,856	$ 2,727