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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Water Revenue Adjustment Mechanism [Member] | GOLDEN STATE WATER COMPANY        
Regulatory matters:        
Deferred Revenue   $ 320 $ 910 $ 1,400
Minimum | Other Regulatory Assets Net [Member]        
Regulatory matters:        
Timing of Court Decision 45 days      
Minimum | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY        
Regulatory matters:        
Regulatory Asset Recovery Periods 12 months      
Maximum [Member] | Other Regulatory Assets Net [Member]        
Regulatory matters:        
Timing of Court Decision 60 days      
Maximum [Member] | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY        
Regulatory matters:        
Regulatory Asset Recovery Periods 24 months