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Regulatory Matters: (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Regulatory matters:      
Regulatory asset not accruing carrying costs $ 53,500    
Other Liabilities, Current 10,185   $ 10,209
Pension and other post-retirement obligations      
Regulatory matters:      
Regulatory asset not accruing carrying costs 23,500    
Derivative unrealized loss      
Regulatory matters:      
Regulatory asset not accruing carrying costs 4,900    
GOLDEN STATE WATER COMPANY      
Regulatory matters:      
Regulatory assets 150,060   132,696
Other Liabilities, Current 9,955   9,921
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account      
Regulatory matters:      
Regulatory Asset Amount Billed to Customers as Surcharges 6,405 $ 96  
Regulatory assets 61,627   45,171
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case      
Regulatory matters:      
Regulatory assets 12,375   12,699
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations      
Regulatory matters:      
Regulatory assets 25,215   21,996
GOLDEN STATE WATER COMPANY | Derivative unrealized loss      
Regulatory matters:      
Regulatory assets     7,053
GOLDEN STATE WATER COMPANY | Flow-through taxes, net      
Regulatory matters:      
Regulatory assets 16,923   16,176
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts      
Regulatory matters:      
Regulatory assets 8,744   8,699
GOLDEN STATE WATER COMPANY | Other regulatory assets      
Regulatory matters:      
Regulatory assets 26,264   25,668
GOLDEN STATE WATER COMPANY | Various refunds to customers      
Regulatory matters:      
Regulatory assets $ (6,021)   $ (4,766)