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Regulatory Matters 3 (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Regulatory matters:
Under (over) collection	$ 16,539	$ (2,450)
Other Liabilities, Current	10,437	10,341
GSWC
Regulatory matters:
Under (over) collection	12,373	(2,450)
Other Liabilities, Current	9,403	9,745
Other Regulatory Assets | GSWC
Regulatory matters:
Under (over) collection	10,670	23,662
Other Regulatory Assets | Bear Valley Electric Service, Inc.
Regulatory matters:
Under (over) collection	2,629	0
Pension Costs and Other Postretirement Benefit Costs | GSWC
Regulatory matters:
Regulatory asset authorized under settlement	66,600
Under (over) collection	65,576	$ 40,693
Under Collection in Two Way Pension Balancing Account [Member] | Pension Costs and Other Postretirement Benefit Costs | Bear Valley Electric Service, Inc.
Regulatory matters:
Under (over) collection	(206)
Under Collection in Two Way Pension Balancing Account [Member] | Pension Costs and Other Postretirement Benefit Costs | Golden State Water Company and Bear Valley Electric Service, Inc. [Member]
Regulatory matters:
Under (over) collection	$ (1,000)

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