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Regulatory Matters - Public Utilities General Disclosures (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue accounts:        
Beginning Balance $ 4,984 $ 13,220 $ 18,451 $ 10,043
Regulatory Asset Increase (Decrease) 5,831 760 9,757 3,931
Refunds (Collections) Adjustments (8,708) 0 (26,101) 6
Ending Balance 2,107 13,980 2,107 13,980
Cost-recovery accounts:        
Beginning Balance 19,788 18,097 19,883 15,420
Regulatory Asset Increase (Decrease) 794 1,321 865 4,177
Refunds (Collections) Adjustments (106) (121) (272) (300)
Ending Balance 20,476 19,297 20,476 19,297
Total        
Beginning Balance 24,772 31,317 38,334 25,463
Regulatory Asset Increase (Decrease) 6,625 2,081 10,622 8,108
Refunds (Collections) Adjustments (8,814) (121) (26,373) (294)
Ending Balance 22,583 33,277 22,583 33,277
MWRAM        
Revenue accounts:        
Beginning Balance 21,096 15,278 16,866 12,077
Regulatory Asset Increase (Decrease) 1,381 363 5,610 3,563
Refunds (Collections) Adjustments 0 0 1 1
Ending Balance 22,477 15,641 22,477 15,641
WCMA        
Revenue accounts:        
Beginning Balance (14,961) 668 3,534 666
Regulatory Asset Increase (Decrease) 3,868 0 2,768 0
Refunds (Collections) Adjustments (8,708) 0 (26,103) 2
Ending Balance (19,801) 668 (19,801) 668
Cost of capital memorandum account        
Revenue accounts:        
Beginning Balance (1,568) (1,562) (1,563) (1,561)
Regulatory Asset Increase (Decrease) (8) 0 (13) (1)
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance (1,576) (1,562) (1,576) (1,562)
All others        
Revenue accounts:        
Beginning Balance 417 (1,164) (386) (1,139)
Regulatory Asset Increase (Decrease) 590 397 1,392 369
Refunds (Collections) Adjustments 0 0 1 3
Ending Balance 1,007 (767) 1,007 (767)
Cost-recovery accounts:        
Beginning Balance 479 446 445 445
Regulatory Asset Increase (Decrease) (79) 0 (45) 1
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance 400 446 400 446
Water supply costs        
Cost-recovery accounts:        
Beginning Balance 11,111 9,895 10,545 8,123
Regulatory Asset Increase (Decrease) 391 388 957 2,159
Refunds (Collections) Adjustments 0 0 0 1
Ending Balance 11,502 10,283 11,502 10,283
Pension        
Cost-recovery accounts:        
Beginning Balance 5,069 4,210 4,941 3,478
Regulatory Asset Increase (Decrease) 59 366 187 1,098
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance 5,128 4,576 5,128 4,576
PRVMA        
Cost-recovery accounts:        
Beginning Balance 543 928 707 1,108
Regulatory Asset Increase (Decrease) 3 0 5 0
Refunds (Collections) Adjustments (106) (121) (272) (301)
Ending Balance 440 807 440 807
CEMA        
Cost-recovery accounts:        
Beginning Balance 2,586 2,618 3,245 2,266
Regulatory Asset Increase (Decrease) 420 567 (239) 919
Refunds (Collections) Adjustments 0 0 0 0
Ending Balance $ 3,006 $ 3,185 $ 3,006 $ 3,185