Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ (1,185)	$ 1,876	$ 13,764	$ 22,173
Flow through related to deduction of meters and mixed service costs	1,192	(5,277)	(18,643)	(5,277)
Tax effect of regulatory treatment of utility plant differences	420	(1,697)	(6,878)	(8,748)
State income tax expense	(45)	166	856	885
Settlement of equity awards			(19)	909
Settlement of prior year tax returns	(318)	(400)	(318)	(400)
Other	93	(100)	(440)	(412)
Total income tax expense (benefit)	$ 157	$ (5,432)	$ (11,678)	$ 9,130
Federal income taxes at statutory rates	21.00%	21.00%	21.00%	21.00%
Flow through related to deduction of meters and mixed service costs	(21.10%)	(59.10%)	(28.40%)	(5.00%)
Tax effect of regulatory treatment of utility plant differences	(7.50%)	(19.00%)	(10.50%)	(8.30%)
State income tax expense	0.80%	1.90%	1.30%	0.80%
Settlement of equity awards				0.90%
Settlement of prior year tax returns percent	5.60%	(4.50%)	(0.50%)	(0.40%)
Other	(1.60%)	(1.10%)	(0.70%)	(0.40%)
Total income tax expense (benefit)	(2.80%)	(60.80%)	(17.80%)	8.60%