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DEBT - LONG TERM DEBT (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Apr. 18, 2019
USD ($)
First_mortgage_bond
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Proceeds from sale-leaseback transaction       $ 9,895 $ 7,820
Subsequent Event          
Debt Instrument [Line Items]          
Number of first mortgage bonds | First_mortgage_bond 3        
Proceeds from reissuance of first mortgage bond $ 35,800        
First Mortgage Bond | Subsequent Event          
Debt Instrument [Line Items]          
Weighted average interest rate 3.02%        
NJNG          
Debt Instrument [Line Items]          
Proceeds from sale-leaseback transaction   $ 9,900 $ 7,800    
Remaining principal payments       $ 1,100 $ 1,100