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Regulatory Matters 3 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Regulatory matters:
Under (over) collection	$ (22,796)	$ 16,539
Under (over) collection	22,796	(16,539)
Other Liabilities, Current	11,498	10,437
GSWC
Regulatory matters:
Under (over) collection	(24,082)	12,373
Under (over) collection	24,082	(12,373)
Other Liabilities, Current	10,505	9,403
Other Regulatory Assets | GSWC
Regulatory matters:
Under (over) collection	11,739	10,670
Under (over) collection	(11,739)	(10,670)
Other Regulatory Assets | Bear Valley Electric Service, Inc.
Regulatory matters:
Under (over) collection	13,916	9,451
Under (over) collection	(13,916)	(9,451)
Pension Costs and Other Postretirement Benefit Costs | GSWC
Regulatory matters:
Regulatory asset authorized under settlement	25,000
Under (over) collection	25,212	65,576
Regulatory Assets	25,000
Under (over) collection	(25,212)	$ (65,576)
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	(246)
Under (over) collection	246
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	261
Under (over) collection	$ (261)

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