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Regulatory Matters (Tables)
 6 Months Ended
Jun. 30, 2022
Regulated Operations [Abstract]  
Schedule of Regulatory Assets, Net
Regulatory assets, net are comprised of the following as of June 30, 2022, and December 31, 2021:
June 30, 2022December 31, 2021
Regulatory assets:
Income tax temporary differences, net$25,946 22,420 
Postretirement pensions and other postretirement benefits64,022 62,197 
Business combinations debt premium, net18,667 19,937 
Balancing and memorandum accounts, net24,772 38,334 
Water Rate Adjustment(1,176)2,588 
Other, net9,922 9,145 
Total regulatory assets, net in Condensed Consolidated Balance Sheets142,153 154,621 
Less: current regulatory assets, net2,841 2,629 
Total regulatory assets, net, less current portion$139,312 151,992 
Public Utilities General Disclosures
Balancing and memorandum accounts recorded to regulatory assets, net for the three and six months ended June 30, 2022, and 2021 as follows:
 Three months ended June 30, 2022Three months ended June 30, 2021
Beginning BalanceRegulatory Asset Increase (Decrease)Refunds (Collections) AdjustmentsEnding BalanceBeginning BalanceRegulatory Asset Increase (Decrease)Refunds (Collections) AdjustmentsEnding Balance
Revenue accounts:
MWRAM$19,060 2,036 — 21,096 $13,853 1,424 1 15,278 
WCMA(3,061)(1,000)(10,900)(14,961)666 — 2 668 
Cost of capital memorandum account(1,564)(4)— (1,568)(1,561)(1)— (1,562)
All others(73)490 — 417 (1,313)147 2 (1,164)
Total revenue accounts$14,362 1,522 (10,900)4,984 $11,645 1,570 5 13,220 
Cost-recovery accounts:
Water supply costs10,789 322 — 11,111 8,910 984 1 9,895 
Pension5,006 63 — 5,069 3,844 366 — 4,210 
Hydro Generation Research, Development and Demonstration Memorandum Account (“PRVMA”)
632 1 (90)543 1,027 — (99)928 
COVID-19 Catastrophic Event Memorandum Account (“CEMA”)2,438 148 — 2,586 2,266 352 — 2,618 
All others573 (94)— 479 445 1 — 446 
Total cost-recovery accounts$19,438 440 (90)19,788 $16,492 1,703 (98)18,097 
Total$33,800 1,962 (10,990)24,772 $28,137 3,273 (93)31,317 
 Six months ended June 30, 2022Six months ended June 30, 2021
Beginning BalanceRegulatory Asset Increase (Decrease)Refunds (Collections) AdjustmentsEnding BalanceBeginning BalanceRegulatory Asset Increase (Decrease)Refunds (Collections) AdjustmentsEnding Balance
Revenue accounts:
MWRAM$16,866 4,229 1 21,096 $12,077 3,200 1 15,278 
WCMA3,534 (1,100)(17,395)(14,961)666 — 2 668 
Cost of capital memorandum account(1,563)(5)— (1,568)(1,561)(1)— (1,562)
All others(386)802 1 417 (1,139)(28)3 (1,164)
Total revenue accounts$18,451 3,926 (17,393)4,984 $10,043 3,171 6 13,220 
Cost-recovery accounts:
Water supply costs10,545 566 — 11,111 8,123 1,771 1 9,895 
Pension4,941 128 — 5,069 3,478 732 — 4,210 
PRVMA
707 2 (166)543 1,108 — (180)928 
CEMA3,245 (659)— 2,586 2,266 352 — 2,618 
All others445 34 — 479 445 1 — 446 
Total cost-recovery accounts$19,883 71 (166)19,788 $15,420 2,856 (179)18,097 
Total$38,334 3,997 (17,559)24,772 $25,463 6,027 (173)31,317