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Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 805,594	$ 736,326	$ 678,168
Alternative revenue programs, net	6,672	6,181	3,634
Other balancing and memorandum accounts and regulatory mechanisms, net	(11,919)	(153)	(17,123)
Rental income	243	6,085	5,684
Operating revenue	800,590	748,439	670,363
Regulated operating revenue, water surcharge	$ 3,927	$ 3,668	$ 4,085

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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