Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities			$ 3,001	$ 70,875
GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities			3,602	68,016
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			2,900
Increase (Decrease) in Regulatory Assets and Liabilities	$ 0	$ 92	0	184
Pension Benefits | GSWC
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment — deferred	(1,400)		(1,400)
Pension Benefits | BVES
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment — deferred	(500)		(500)
Pension Benefits | Water: | GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities	$ 100	$ (100)	$ 300	$ (200)