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Regulatory Matters: (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 01, 2019
May 30, 2019
Dec. 31, 2018
Regulatory matters:              
Regulatory asset not accruing carrying costs $ (55,700)   $ (55,700)        
Pension and other post-retirement obligations              
Regulatory matters:              
Regulatory asset not accruing carrying costs (35,300)   (35,300)        
GOLDEN STATE WATER COMPANY              
Regulatory matters:              
Regulatory assets 13,284   13,284       $ 28,340
GOLDEN STATE WATER COMPANY | Tax Cuts and Jobs Act memorandum accounts              
Regulatory matters:              
Regulatory assets 8,987   8,987       8,293
GOLDEN STATE WATER COMPANY | Various refunds to customers              
Regulatory matters:              
Regulatory assets 9,358   9,358       7,517
GOLDEN STATE WATER COMPANY | Authorized Capital Infrastructure [Member]              
Regulatory matters:              
Regulatory assets           $ (334,500)  
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account              
Regulatory matters:              
Amount billed to customers as surcharges 832 $ 5,600 3,600 $ 9,800      
Regulatory assets (30,522)   (30,522)       (17,763)
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case              
Regulatory matters:              
Regulatory assets (9,166)   (9,166)       (9,516)
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations              
Regulatory matters:              
Regulatory assets (32,444)   (32,444)       (33,124)
GOLDEN STATE WATER COMPANY | Derivative [Member]              
Regulatory matters:              
Regulatory asset not accruing carrying costs (267)   (267)        
GOLDEN STATE WATER COMPANY | Derivative unrealized loss              
Regulatory matters:              
Regulatory assets (267)   (267)       (311)
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts              
Regulatory matters:              
Regulatory assets (1,787)   (1,787)       (2,784)
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts              
Regulatory matters:              
Regulatory assets (8,025)   (8,025)       (5,054)
GOLDEN STATE WATER COMPANY | Deferred Income Tax Charge              
Regulatory matters:              
Regulatory asset not accruing carrying costs (80,700)   (80,700)        
Regulatory assets 80,690   80,690       81,465
GOLDEN STATE WATER COMPANY | Flow-through taxes, net              
Regulatory matters:              
Regulatory asset not accruing carrying costs (14,200)   (14,200)        
Regulatory assets 14,160   14,160       15,273
GOLDEN STATE WATER COMPANY | Other Regulatory Assets Net [Member]              
Regulatory matters:              
Regulatory assets (17,700)   (17,700)       $ (15,656)
GOLDEN STATE WATER COMPANY | Deferred Project Costs [Member]              
Regulatory matters:              
Regulatory assets           $ (20,400)  
GOLDEN STATE WATER COMPANY | Other Regulatory Assets (Liabilities) [Member]              
Regulatory matters:              
Regulatory assets (1,100)   (1,100)        
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member]              
Regulatory matters:              
Regulatory assets (19,700)   (19,700)        
Water general rate case [Member] | General Rate Case Memorandum Accounts              
Regulatory matters:              
Regulatory assets $ (5,600)   $ (5,600)        
Subsequent Event [Member] | Water Service Utility Operations [Member] | Tax Cuts and Jobs Act memorandum accounts              
Regulatory matters:              
Regulatory assets         $ 7,200    
Maximum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account              
Regulatory matters:              
Regulatory Asset Recovery Periods     24 months        
Maximum [Member] | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts              
Regulatory matters:              
Regulatory Asset Recovery Periods     24 months        
Minimum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account              
Regulatory matters:              
Regulatory Asset Recovery Periods     12 months        
Minimum [Member] | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts              
Regulatory matters:              
Regulatory Asset Recovery Periods     12 months