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Derivative Instruments (Details) - GOLDEN STATE WATER COMPANY
MWh in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
MWh
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]        
Description of derivative activity volume | MWh 526      
Commodity Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of broker quotes received to determine fair value of derivative instrument 1   1  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value at beginning of the period $ (6,176) $ 0 $ (3,339) $ 0
Unrealized gain (loss) on purchased power contracts 514 0 (2,323) 0
Fair value at end of the period $ (5,662) $ 0 $ (5,662) $ 0
Minimum | Commodity Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Term of derivative contract     3 years  
Maximum | Commodity Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Term of derivative contract     5 years