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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ 664,358 $ 674,736 $ 622,474
Revenue not from contract with customer 50,199 23,460 53,639
Total non-regulated revenue 19,205 18,272 15,898
Residential      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 446,323 450,062 415,893
Business      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 129,223 130,041 118,279
Industrial      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 31,857 34,236 28,905
Public authorities      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 33,862 34,511 31,671
Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 23,093 25,886 27,726
Operating and maintenance revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 12,655 10,392 8,621
Other non-regulated revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 4,271 5,413 5,262
Non-regulated revenue from contracts with customers      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 16,926 15,805 13,883
Lease revenue 2,279    
Lease revenue   2,467 2,015
Total non-regulated revenue $ 19,205 $ 18,272 $ 15,898