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Derivative Instruments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
MWh
Sep. 30, 2018
USD ($)
Commodity Contract        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value at end of the period $ 3,000   $ 3,000  
GOLDEN STATE WATER COMPANY        
Derivative Instruments, Gain (Loss) [Line Items]        
Description of derivative activity volume | MWh     674,961  
GOLDEN STATE WATER COMPANY | Commodity Contract        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value at beginning of the period (267) $ (1,710) $ (311) $ (2,941)
Unrealized gain (loss) on purchased power contracts (2,755) 567 (2,711) 1,798
Fair value at end of the period $ (3,022) $ (1,143) (3,022) $ (1,143)
GOLDEN STATE WATER COMPANY | Minimum | Commodity Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Term of derivative contract 3 years      
GOLDEN STATE WATER COMPANY | Maximum | Commodity Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Term of derivative contract 5 years      
Electric Power Purchase Commitments [Member] | Electric Service Utility Operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Purchase Obligation $ 28,000   $ 28,000