INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Developer deposits for contributions in aid of construction	$ 34,353	$ 33,244
Net operating loss carry-forward and tax credits	14,183	29,406
Pension liability	18,993	16,896
Income tax regulatory liability	13,893	18,364
Operating leases liabilities	3,778	3,796
Other	2,019	3,614
Total deferred tax assets	87,219	105,320
Deferred tax liabilities:
Property related basis and depreciation differences	482,124	437,224
WRAM/MCBA and interim rates balancing accounts	0	4,875
Operating lease-right to use asset	3,722	3,746
Other	12,456	12,237
Total deferred tax liabilities	498,302	458,082
Net deferred tax liabilities	$ 411,083	$ 352,762