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Regulatory Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2020
Regulated Operations [Abstract]  
Schedule of regulatory assets and liabilities
Regulatory assets and liabilities were comprised of the following as of September 30, 2020 and December 31, 2019:
 Recovery PeriodSeptember 30, 2020December 31, 2019
Regulatory Assets  
Pension and retiree group healthIndefinitely$207,828 $208,321 
Property-related temporary differences (tax benefits flowed through to customers)Indefinitely107,962 104,931 
Other accrued benefitsIndefinitely21,434 20,030 
Net WRAM and MCBA long-term accounts receivable
1 - 2 years
40,036 25,465 
Asset retirement obligations, netIndefinitely21,018 19,567 
Interim rates long-term accounts receivable1 year21,672 4,642 
Tank coating10 years14,209 13,535 
Recoverable property losses10 years4,775 5,000 
PCBA1 year32,819 21,465 
Other components of net periodic benefit costIndefinitely6,316 5,145 
Other regulatory assetsVarious6,366 5,221 
Total Regulatory Assets$484,435 $433,322 
Regulatory Liabilities  
Future tax benefits due to customers$173,048 $194,501 
HCBA7,407 4,271 
CEBA2,926 2,742 
Net WRAM and MCBA long-term payable374 211 
Tax accounting memorandum account711 806 
Cost of capital memorandum account15 151 
1,2,3 trichloropropane (TCP) settlement proceeds9,084 8,426 
Other regulatory liabilities374 305 
Total Regulatory Liabilities$193,939 $211,413