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Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 736,326	$ 678,168	$ 586,918
Alternative revenue programs, net	6,181	3,634	(1,312)
Other balancing and memorandum accounts and regulatory mechanisms, net	(153)	(17,123)	29,487
Rental income	6,085	5,684	5,605
Operating revenue	748,439	670,363	620,698
Regulated operating revenue, water surcharge	$ 3,668	$ 4,085	$ 6,121

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