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Balancing and Memorandum Accounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance $ 8,287 $ 21,628 $ (1,940) $ 25,549
Balancing and Memorandum Revenue Account, Increase (Decrease) (1,087) (9,275) 2,299 (5,410)
Refunds (Collections) Adjustments 2,626 (7,658) 9,467 (15,444)
Ending Balance 9,826 4,695 9,826 4,695
Balancing and Memorandum Cost Recovery Account [Roll Forward]        
Beginning Balance 9,328 6,549 7,223 8,864
Regulatory Asset Increase (Decrease) 2,188 1,250 4,309 (164)
Refunds (Collections) Adjustments (7) (886) (23) (1,787)
Ending Balance 11,509 6,913 11,509 6,913
Balancing and Memorandum Account [Roll Forward]        
Beginning Balance 17,615 28,177 5,283 34,413
Regulatory Asset Increase (Decrease) 1,101 (8,025) 6,608 (5,574)
Refunds (Collections) 2,619 (8,544) 9,444 (17,231)
Ending Balance 21,335 11,608 21,335 11,608
Total balance, net under-collection amount $ 2,245   $ 2,245  
Authorized revenue, threshold percentage 2.00%   2.00%  
Monterey WRAM        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance $ 10,549 8,986 $ 7,015 6,847
Balancing and Memorandum Revenue Account, Increase (Decrease) (1,124) 328 2,437 3,994
Refunds (Collections) Adjustments 2,625 (1,502) 2,598 (3,029)
Ending Balance 12,050 7,812 12,050 7,812
2014-2017 WCMA        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance 665 5,315 708 7,750
Balancing and Memorandum Revenue Account, Increase (Decrease) 0 0 0 0
Refunds (Collections) Adjustments 1 (2,397) (42) (4,832)
Ending Balance 666 2,918 666 2,918
2018 WCMA        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance 0 8,958 0 9,386
Balancing and Memorandum Revenue Account, Increase (Decrease) 0 (8,958) 0 (9,386)
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance 0 0 0 0
2019 WCMA        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance 0 557 0 0
Balancing and Memorandum Revenue Account, Increase (Decrease) 0 (557) 0 0
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance 0 0 0 0
2012 General Rate Case true-up        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance 752 7,731 752 11,328
Balancing and Memorandum Revenue Account, Increase (Decrease) 0 (1) 0 95
Refunds (Collections) Adjustments 0 (3,631) 0 (7,324)
Ending Balance 752 4,099 752 4,099
Cost of capital memorandum account        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance (1,560) (1,540) (1,553) (1,523)
Balancing and Memorandum Revenue Account, Increase (Decrease) (1) (7) (8) (24)
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance (1,561) (1,547) (1,561) (1,547)
Tax memorandum account        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance 332 (6,585) (6,643) (6,504)
Balancing and Memorandum Revenue Account, Increase (Decrease) 1 (33) (2) (114)
Refunds (Collections) Adjustments 0 0 6,978 0
Ending Balance 333 (6,618) 333 (6,618)
All others        
Balancing and Memorandum Revenue Account [Roll Forward]        
Beginning Balance (2,451) (1,794) (2,219) (1,735)
Balancing and Memorandum Revenue Account, Increase (Decrease) 37 (47) (128) 25
Refunds (Collections) Adjustments 0 (128) (67) (259)
Ending Balance (2,414) (1,969) (2,414) (1,969)
Balancing and Memorandum Cost Recovery Account [Roll Forward]        
Beginning Balance 444 870 446 1,090
Regulatory Asset Increase (Decrease) 0 2 2 8
Refunds (Collections) Adjustments 0 (223) (4) (449)
Ending Balance 444 649 444 649
Water supply costs        
Balancing and Memorandum Cost Recovery Account [Roll Forward]        
Beginning Balance 5,899 5,912 4,328 9,617
Regulatory Asset Increase (Decrease) 1,222 1,049 2,827 (754)
Refunds (Collections) Adjustments 1 (1,871) (33) (3,773)
Ending Balance 7,122 5,090 7,122 5,090
Pension        
Balancing and Memorandum Cost Recovery Account [Roll Forward]        
Beginning Balance 2,985 (233) 2,449 (1,843)
Regulatory Asset Increase (Decrease) (253) 199 261 582
Refunds (Collections) Adjustments 0 1,208 22 2,435
Ending Balance 2,732 1,174 2,732 1,174
PRVMA        
Balancing and Memorandum Cost Recovery Account [Roll Forward]        
Beginning Balance 0 0 0 0
Regulatory Asset Increase (Decrease) 1,219 0 1,219 0
Refunds (Collections) Adjustments (8) 0 (8) 0
Ending Balance $ 1,211 $ 0 $ 1,211 $ 0