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Balancing and Memorandum Accounts - Public Utilities General Disclosures (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue accounts:    
Beginning Balance $ 10,043 $ (1,940)
Regulatory Asset Increase (Decrease) 1,601 1,757
Refunds (Collections) Adjustments 1 6,841
Ending Balance 11,645 6,658
Cost-recovery accounts:    
Beginning Balance 15,420 7,223
Regulatory Asset Increase (Decrease) 1,153 1,183
Refunds (Collections) Adjustments (81) (16)
Ending Balance 16,492 8,390
Total    
Beginning Balance 25,463 5,283
Regulatory Asset Increase (Decrease) 2,754 2,940
Refunds (Collections) Adjustments (80) 6,825
Ending Balance $ 28,137 15,048
Authorized revenue, threshold percentage 2.00%  
Monterey WRAM    
Revenue accounts:    
Beginning Balance $ 12,077 7,015
Regulatory Asset Increase (Decrease) 1,776 1,970
Refunds (Collections) Adjustments 0 (27)
Ending Balance 13,853 8,958
2014-2017 WCMA    
Revenue accounts:    
Beginning Balance 666 708
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) Adjustments 0 (43)
Ending Balance 666 665
2012 General Rate Case true-up    
Revenue accounts:    
Beginning Balance 752 752
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) Adjustments 1 0
Ending Balance 753 752
Cost of capital memorandum account    
Revenue accounts:    
Beginning Balance (1,561) (1,553)
Regulatory Asset Increase (Decrease) 0 (5)
Refunds (Collections) Adjustments 0 0
Ending Balance (1,561) (1,558)
Tax memorandum account    
Revenue accounts:    
Beginning Balance 333 (6,643)
Regulatory Asset Increase (Decrease) 0 (3)
Refunds (Collections) Adjustments 0 6,978
Ending Balance 333 332
All others    
Revenue accounts:    
Beginning Balance (2,224) (2,219)
Regulatory Asset Increase (Decrease) (175) (205)
Refunds (Collections) Adjustments 0 (67)
Ending Balance (2,399) (2,491)
Cost-recovery accounts:    
Beginning Balance 445 446
Regulatory Asset Increase (Decrease) 0 1
Refunds (Collections) Adjustments 0 (4)
Ending Balance 445 443
Water supply costs    
Cost-recovery accounts:    
Beginning Balance 8,123 4,328
Regulatory Asset Increase (Decrease) 787 767
Refunds (Collections) Adjustments 0 (34)
Ending Balance 8,910 5,061
Pension    
Cost-recovery accounts:    
Beginning Balance 3,478 2,449
Regulatory Asset Increase (Decrease) 366 415
Refunds (Collections) Adjustments 0 22
Ending Balance 3,844 2,886
Hydro Generation Research, Development and Demonstration Memorandum Account (“PRVMA”)    
Cost-recovery accounts:    
Beginning Balance 1,108 0
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) Adjustments (81) 0
Ending Balance 1,027 0
COVID-19 Catastrophic Event Memorandum Account (“CEMA”)    
Cost-recovery accounts:    
Beginning Balance 2,266 0
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) Adjustments 0 0
Ending Balance $ 2,266 $ 0