Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ 4,904	$ 2,452	$ 20,402	$ 12,577
Flow through related to deduction of meters and mixed service costs	(2,898)	(5,689)	(11,683)	(19,212)
Tax effect of regulatory treatment of utility plant differences	(1,463)	(1,525)	(5,974)	(5,212)
State income tax expense	179	232	718	798
Tax credits	(94)	(1,135)	(400)	(1,135)
Other	(133)	(145)	(262)	(254)
Total income tax expense (benefit)	$ 495	$ (5,810)	$ 2,801	$ (12,438)
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	(12.40%)	(48.70%)	(12.00%)	(32.10%)
Tax effect of regulatory treatment of utility plant differences	(6.30%)	(13.10%)	(6.10%)	(8.70%)
State income tax expense	0.80%	2.00%	0.70%	1.30%
Tax credits	(0.40%)	(9.70%)	(0.40%)	(1.90%)
Other	(0.60%)	(1.30%)	(0.30%)	(0.40%)
Total income tax benefit	2.10%	(49.80%)	2.90%	(20.80%)