Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ 28,886	$ 28,977	$ 33,467
Tax effect of regulatory treatment of utility plant differences	(12,270)	(12,366)	(13,820)
State income tax expense	2,077	1,676	1,385
Flow through related to deduction of meters and mixed service costs	(47,983)	(34,454)	(8,678)
Tax credits	(2,334)	(258)	(75)
Other	(2,006)	(766)	(248)
Total income tax expense (benefit)	$ (33,630)	$ (17,191)	$ 12,031
Federal statutory tax rate	21.00%	21.00%	21.00%	21.00%	35.00%
Tax effect of regulatory treatment of utility plant differences	(8.90%)	(9.00%)	(8.70%)
State income tax expense	1.50%	1.20%	0.80%
Flow through related to deduction of meters and mixed service costs	(34.90%)	(25.00%)	(5.40%)
Tax credits	(1.70%)	(0.20%)
Other	(1.40%)	(0.50%)	(0.20%)
Effective Income Tax Rate Reconciliation, Percent	(24.40%)	(12.50%)	7.50%