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Regulatory Matters: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Regulatory matters:          
Regulatory asset not accruing carrying costs $ 56,200   $ 56,200    
Other Liabilities, Current 11,742   11,742   $ 11,297
Pension and other post-retirement obligations          
Regulatory matters:          
Regulatory asset not accruing carrying costs 26,300   26,300    
Derivative unrealized loss          
Regulatory matters:          
Regulatory asset not accruing carrying costs 4,493   4,493    
GOLDEN STATE WATER COMPANY          
Regulatory matters:          
Regulatory assets 145,494   145,494   146,281
Other Liabilities, Current 11,399   11,399   10,925
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account          
Regulatory matters:          
Regulatory Asset Amount Billed to Customers as Surcharges 9,500 $ 5,000 13,400 $ 6,400  
Regulatory assets 48,277   48,277   47,340
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case          
Regulatory matters:          
Regulatory assets 11,470   11,470   11,820
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations          
Regulatory matters:          
Regulatory assets 26,575   26,575   28,118
GOLDEN STATE WATER COMPANY | Derivative unrealized loss          
Regulatory matters:          
Regulatory assets         4,901
GOLDEN STATE WATER COMPANY | Flow-through taxes, net          
Regulatory matters:          
Regulatory assets 20,627   20,627   20,134
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts          
Regulatory matters:          
Regulatory assets 8,019   8,019   8,272
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member]          
Regulatory matters:          
Regulatory assets 13,780   13,780   13,929
GOLDEN STATE WATER COMPANY | Other regulatory assets          
Regulatory matters:          
Regulatory assets 17,016   17,016   17,633
GOLDEN STATE WATER COMPANY | Various refunds to customers          
Regulatory matters:          
Regulatory assets (4,763)   (4,763)   $ (5,866)
Water Service Utility Operations | General Rate Case Memorandum Accounts [Member]          
Regulatory matters:          
Regulatory assets $ 9,900   $ 9,900    
Maximum | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account          
Regulatory matters:          
Regulatory Asset Recovery Periods     24 months    
Maximum | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member]          
Regulatory matters:          
Regulatory Asset Recovery Periods     24 months