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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Taxes and Interest Paid:
Income taxes paid	$ 21,084	$ 13,615	$ 10,916
Interest paid	23,471	22,762	22,305
Non-Cash Transactions:
Accrued payables for investment in utility plant	27,403	20,131	17,236
Property installed by developers and conveyed	2,082	2,082	5,395
GSWC
Taxes and Interest Paid:
Income taxes paid	19,448	4,822	8,437
Interest paid	22,721	22,282	22,078
Non-Cash Transactions:
Accrued payables for investment in utility plant	27,403	20,128	17,207
Property installed by developers and conveyed	$ 2,082	$ 2,082	$ 5,395

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