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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Other Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lessor, Lease, Description [Line Items]    
Operating Lease, Liability $ 14,380  
Optional lease renewal term 15 years  
Asset retirement obligation $ 25,600 $ 24,300
Maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized 24 months  
Minimum collection period after net receivable balances were recognized in which the Company defers net WRAM and MCBA operating revenues and associated costs 12 months  
Minimum    
Lessor, Lease, Description [Line Items]    
Term of contract 5 years  
Maximum    
Lessor, Lease, Description [Line Items]    
Term of contract 10 years  
Accounting Standards Update 2016-02    
Lessor, Lease, Description [Line Items]    
Operating Lease, Liability $ 13,800