Taxes Other Than Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 19,433	$ 14,868	$ 35,869	$ 29,837
Property [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	8,275	6,929	15,308	13,395
Gross Receipts, Excise And Franchise [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	3,579	3,538	6,701	6,757
Payroll [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	4,693	2,291	8,973	5,772
Regulatory Assessments [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	698	748	1,398	1,495
Pumping Fees [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	1,487	1,272	2,568	2,241
Other [Member]
Taxes Other Than Income [Line Items]
Total taxes other than income	$ 701	$ 90	$ 921	$ 177