Taxes Other Than Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 21,058	$ 20,555	$ 63,219	$ 56,424
Property [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	8,623	8,437	25,907	23,746
Gross Receipts, Excise And Franchise [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	4,223	4,023	11,857	10,724
Payroll [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	5,082	4,788	16,556	13,760
Regulatory Assessments [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	951	867	2,637	2,266
Pumping Fees [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	1,752	1,941	4,343	4,509
Other [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 427	$ 499	$ 1,919	$ 1,419