XML 46 R33.htm IDEA: XBRL DOCUMENT v3.8.0.1
Contingencies and Gain on Sale of Assets (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 08, 2017
USD ($)
connection
Oct. 31, 2017
USD ($)
customer
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
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       $ 1,181,616,000 1,181,616,000 1,128,588,000 $ 1,150,926,000
Accounts receivable       29,392,000 29,392,000   19,993,000
Total Assets       1,486,486,000 1,486,486,000 1,440,386,000 1,470,493,000
Advances for construction       (67,438,000) (67,438,000)   (69,722,000)
Contributions in aid of construction - net       123,569,000 123,569,000   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       1,175,343,000 1,175,343,000   1,145,311,000
Accounts receivable       29,392,000 29,392,000   19,993,000
Regulatory assets       130,906,000 130,906,000   146,281,000
Total Assets       1,405,198,000 1,405,198,000   1,384,178,000
Advances for construction       (67,438,000) (67,438,000)   (69,722,000)
Contributions in aid of construction - net       123,569,000 123,569,000   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 [Member] | GOLDEN STATE WATER COMPANY              
Loss Contingencies [Line Items]              
Litigation Settlement, Expense         $ 5,900,000    
Ojai Water System              
Loss Contingencies [Line Items]              
Loss contingency number of customers served | connection 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      
Maximum | City of Claremont [Member]              
Loss Contingencies [Line Items]              
Litigation Settlement, Expense             $ 7,600,000
Subsequent Event              
Loss Contingencies [Line Items]              
Litigation Settlement, Expense   $ 895,000          
Subsequent Event | City of Claremont [Member]              
Loss Contingencies [Line Items]              
Registration Payment Arrangement, Period   12 years          
Subsequent Event | City of Claremont [Member] | Condemnation of Properties | GOLDEN STATE WATER COMPANY              
Loss Contingencies [Line Items]              
Loss contingency number of customers served | customer   11,000          
Scenario, Forecast [Member] | Subsequent Event | City of Claremont [Member]              
Loss Contingencies [Line Items]              
Litigation Settlement, Expense     $ 2,000,000