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Regulatory Maters - Public Utilities General Disclosures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 27, 2020
Dec. 31, 2021
Dec. 31, 2020
Revenue accounts:      
Beginning Balance   $ 10,043 $ (1,940)
Regulatory Asset Increase (Decrease)   8,779 2,516
Refunds (Collections) Adjustments   (371) 9,467
Ending Balance   18,451 10,043
Cost-recovery accounts:      
Beginning Balance   15,420 7,223
Regulatory Asset Increase (Decrease)   4,865 8,324
Refunds (Collections) Adjustments   (402) (127)
Ending Balance   19,883 15,420
Total      
Beginning Balance   25,463 5,283
Regulatory Asset Increase (Decrease)   13,644 10,840
Refunds (Collections) Adjustments   (773) 9,340
Ending Balance   38,334 25,463
MWRAM      
Revenue accounts:      
Beginning Balance   12,077 7,015
Regulatory Asset Increase (Decrease)   4,788 2,464
Refunds (Collections) Adjustments   1 2,598
Ending Balance   16,866 12,077
WCMA      
Revenue accounts:      
Beginning Balance   666 708
Regulatory Asset Increase (Decrease)   3,243 0
Refunds (Collections) Adjustments   (375) (42)
Ending Balance   3,534 666
Cost of capital memorandum accounts      
Revenue accounts:      
Beginning Balance   (1,561) (1,553)
Regulatory Asset Increase (Decrease)   (2) (8)
Refunds (Collections) Adjustments   0 0
Ending Balance   (1,563) (1,561)
Tax memorandum account      
Revenue accounts:      
Beginning Balance   333 (6,643)
Regulatory Asset Increase (Decrease)   0 (2)
Refunds (Collections) Adjustments   0 6,978
Ending Balance   333 333
All others      
Revenue accounts:      
Beginning Balance   (1,472) (1,467)
Regulatory Asset Increase (Decrease)   750 62
Refunds (Collections) Adjustments   3 (67)
Ending Balance   (719) (1,472)
Cost-recovery accounts:      
Beginning Balance   445 446
Regulatory Asset Increase (Decrease)   0 3
Refunds (Collections) Adjustments   0 (4)
Ending Balance   445 445
Water supply costs      
Cost-recovery accounts:      
Beginning Balance   8,123 4,328
Regulatory Asset Increase (Decrease)   2,421 3,828
Refunds (Collections) Adjustments   1 (33)
Ending Balance   10,545 8,123
Pension      
Cost-recovery accounts:      
Beginning Balance   3,478 2,449
Regulatory Asset Increase (Decrease)   1,464 1,008
Refunds (Collections) Adjustments   (1) 21
Ending Balance   4,941 3,478
PRVMA      
Cost-recovery accounts:      
Beginning Balance   1,108 0
Regulatory Asset Increase (Decrease) $ 1,219 1 1,219
Refunds (Collections) Adjustments   (402) (111)
Ending Balance   707 1,108
CEMA      
Cost-recovery accounts:      
Beginning Balance   2,266 0
Regulatory Asset Increase (Decrease)   979 2,266
Refunds (Collections) Adjustments   0 0
Ending Balance   $ 3,245 $ 2,266