Regulatory Assets and Liabilities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Regulatory Assets and Liabilities [Line Items]
Short-term portion of the regulatory assets	$ 50,335		$ 66,826
Short-term portion of the regulatory liabilities	$ 17,272		$ 12,240
Return on equity	9.20%
Approved debt	5.51%
Approved equity	53.40%
Approved equity to debt ratio	46.60%
Proposed return on equity	10.35%
Requested debt	4.23%
Requested equity	53.40%
Requested equity to debt ratio	46.60%
Decrease on annual revenue	$ 11,000	$ 11,000
California Public Advocates Office
Schedule of Regulatory Assets and Liabilities [Line Items]
Recommended return on equity	7.81%
Recommended debt	4.23%
Recommended equity	49.40%
Recommended equity to debt ratio	50.60%