CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating activities:
Net income	$ 19,013	$ 16,551
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,766	29,631
Deferred income taxes	3,120	3,020
Stock-based compensation	1,212	1,210
Allowance for equity funds used during construction	(1,597)	(834)
Changes in operating assets and liabilities, net of acquired assets and liabilities
Accounts receivable and accrued unbilled utility revenue	(742)	5,355
Accounts payable and other current liabilities	(10,034)	(10,742)
Accrued groundwater extraction charges, purchased water and power	(1,390)	(1,807)
Tax receivable and payable, and other accrued taxes	1,629	4,962
Postretirement benefits	(2,028)	(1,294)
Regulatory assets and liabilities excluding cost of removal, income tax temporary differences and postretirement benefits	4,280	(577)
Other noncurrent assets and noncurrent liabilities	2,717	0
Other changes, net	(6,240)	(2,294)
Net cash provided by operating activities	43,706	43,181
Additions to utility plant:
Company-funded	(82,132)	(77,461)
Contributions in aid of construction	(10,376)	(6,884)
Cost to retire utility plant, net of salvage	(424)	(414)
Net cash used in investing activities	(92,932)	(84,759)
Financing activities:
Borrowings from lines of credit	66,923	67,403
Repayments of lines of credit	(153,752)	(33,938)
Long-term borrowings	214	0
Repayments of long-term borrowings	(16,258)	(1,071)
Issuance of common stock, net of issuance costs	288,601	26,545
Dividends paid	(15,912)	(14,142)
Receipts of advances and contributions in aid of construction	12,326	9,838
Refunds of advances for construction	(991)	(674)
Other changes, net	397	199
Net cash provided by financing activities	181,548	54,160
Net change in cash and cash equivalents	132,322	12,582
Cash and cash equivalents, beginning of period	20,686	11,114
Cash and cash equivalents, end of period	153,008	23,696
Cash paid (refunded) during the period for:
Interest	15,790	16,820
Interest, net of amounts capitalized	13,670	15,567
Income taxes	165	(680)
Supplemental disclosure of non-cash activities:
Accrued payables for additions to utility plant	46,703	37,724
Utility property installed by developers	$ 629	$ 999