Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Taxes and Interest Paid:
Income taxes paid	$ 27,850	$ 34,682	$ 27,370
Interest Paid, Excluding Capitalized Interest, Operating Activities	50,347	39,367	26,005
Non-Cash Transactions:
Accrued payables for investment in utility plant	49,600	34,906	40,034
Property installed by developers and conveyed	9,840	4,690	1,549
GSWC
Taxes and Interest Paid:
Income taxes paid	22,840	31,625	20,155
Interest Paid, Excluding Capitalized Interest, Operating Activities	37,994	28,099	22,294
Non-Cash Transactions:
Accrued payables for investment in utility plant	44,256	33,465	38,302
Property installed by developers and conveyed	$ 9,840	$ 4,690	$ 1,549