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Statement of Cash Flows, Supplemental Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Taxes and Interest Paid:
Income taxes paid	$ 13,684	$ 22,496	$ 21,084
Interest paid	19,941	25,080	23,471
Non-Cash Transactions:
Accrued payables for investment in utility plant	27,861	23,736	27,403
Property installed by developers and conveyed	3,102	6,220	2,082
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	8,184	17,206	19,448
Interest paid	19,681	23,925	22,721
Non-Cash Transactions:
Accrued payables for investment in utility plant	25,633	23,736	27,403
Property installed by developers and conveyed	3,102	6,220	2,082
Noncash or Part Noncash Acquisition, Value of Assets Acquired	71,324	0	0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 71,344	$ 0	$ 0

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