Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities			$ (24,197)	$ (11,417)
GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities			(18,011)	(13,175)
Pension Benefits | GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities	$ (900)	$ (400)	(1,800)	$ (800)
Regulatory adjustment — deferred	$ 3,900		$ 3,900