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Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ 15,498	$ 10,126
Flow through related to deduction of meters and mixed service costs	(8,785)	(13,523)
Tax effect of regulatory treatment of utility plant differences	(4,511)	(3,687)
State income tax expense	539	566
Tax credits	(306)
Other	(129)	(110)
Total income tax expense (benefit)	$ 2,306	$ (6,628)
Federal income taxes at statutory rates	21.00%	21.00%
Flow through related to deduction of meters and mixed service costs	(11.90%)	(28.00%)
Tax effect of regulatory treatment of utility plant differences	(6.10%)	(7.70%)
State income tax expense	0.70%	1.20%
Tax credits	(0.40%)
Other	(0.20%)	(0.20%)
Total income tax benefit	3.10%	(13.70%)

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