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Statement of Cash Flows, Supplemental Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Taxes and Interest Paid:
Income taxes paid	$ 34,682	$ 27,370	$ 29,153
Interest Paid, Excluding Capitalized Interest, Operating Activities	39,367	26,005	22,540
Non-Cash Transactions:
Accrued payables for investment in utility plant	34,906	40,034	32,855
Property installed by developers and conveyed	4,690	1,549	7,222
GSWC
Taxes and Interest Paid:
Income taxes paid	31,625	20,155	21,428
Interest Paid, Excluding Capitalized Interest, Operating Activities	28,099	22,294	21,156
Non-Cash Transactions:
Accrued payables for investment in utility plant	33,465	38,302	30,656
Property installed by developers and conveyed	$ 4,690	$ 1,549	$ 7,222

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