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Business Segments 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Total utility plant	$ 1,512,043	$ 1,415,705	$ 1,296,310
Other assets	279,560	225,626
Total Assets	1,791,603	1,641,331
Parent Company
Segment Reporting [Abstract]
Total utility plant	0	0	0
Total Assets	759,716	811,677
GSWC
Segment Reporting [Abstract]
Total utility plant	1,400,489	1,394,742
Total Assets	1,560,782	1,522,454
Segment Reporting Information [Line Items]
Depreciation on transportation equipment	353	316	238
Contracted services: | American States Utility Services [Member]
Segment Reporting [Abstract]
Total utility plant	$ 22,246	$ 20,963	$ 15,218

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