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Statement of Cash Flows, Supplemental Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Taxes and Interest Paid:
Income taxes paid	$ 29,153	$ 13,684	$ 22,496
Interest Paid, Excluding Capitalized Interest, Operating Activities	22,540	19,941	25,080
Non-Cash Transactions:
Accrued payables for investment in utility plant	32,855	27,861	23,736
Property installed by developers and conveyed	7,222	3,102	6,220
Noncash or Part Noncash Acquisition, Value of Assets Acquired	0	0	0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	0	0	0
GSWC
Taxes and Interest Paid:
Income taxes paid	21,428	8,184	17,206
Interest Paid, Excluding Capitalized Interest, Operating Activities	21,156	19,681	23,925
Non-Cash Transactions:
Accrued payables for investment in utility plant	30,656	25,633	23,736
Property installed by developers and conveyed	7,222	3,102	6,220
Noncash or Part Noncash Acquisition, Value of Assets Acquired	0	71,324	0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 0	$ 71,344	$ 0

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