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Contingencies and Gain on Sale of Assets (Details)
 3 Months Ended 6 Months Ended
Jun. 08, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
customer
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]          
Proceeds from sale of assets     $ 34,324,000 $ 0  
Amount spent in clean-up and remediation activities [Abstract]     1,500,000    
Utility plant   $ 1,155,203,000 1,155,203,000 1,107,137,000 $ 1,150,926,000
Accounts receivable   25,338,000 25,338,000   19,993,000
Total Assets   1,462,653,000 1,462,653,000 1,406,299,000 1,470,493,000
Advances for construction   (67,209,000) (67,209,000)   (69,722,000)
Contributions in aid of construction - net   123,607,000 123,607,000   120,518,000
GOLDEN STATE WATER COMPANY          
Loss Contingencies [Line Items]          
Environmental Remediation Expense     5,200,000    
Proceeds from sale of assets     34,324,000 $ 0  
Utility plant   1,149,475,000 1,149,475,000   1,145,311,000
Accounts receivable   25,338,000 25,338,000   19,993,000
Regulatory assets   145,494,000 145,494,000   146,281,000
Total Assets   1,377,385,000 1,377,385,000   1,384,178,000
Advances for construction   (67,209,000) (67,209,000)   (69,722,000)
Contributions in aid of construction - net   123,607,000 123,607,000   $ 120,518,000
Environmental Clean-Up and Remediation | GOLDEN STATE WATER COMPANY          
Loss Contingencies [Line Items]          
Accrued liability for the estimated additional cost to complete the clean-up at the site   1,400,000 $ 1,400,000    
City of Claremont | Condemnation of Properties | GOLDEN STATE WATER COMPANY          
Loss Contingencies [Line Items]          
Loss contingency number of customers served | customer     11,000    
Ojai Water System          
Loss Contingencies [Line Items]          
Loss contingency number of customers served 2,900        
Utility plant $ 22,256,000        
Accounts receivable 721,000        
Regulatory assets 3,944,000        
Total Assets 26,921,000        
Advances for construction (366,000)        
Contributions in aid of construction - net 532,000        
Liabilities (898,000)        
Ojai Water System | GOLDEN STATE WATER COMPANY          
Loss Contingencies [Line Items]          
Proceeds from sale of assets $ 34,300,000        
Gain (loss) on sale of properties   $ 8,300,000