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DERIVATIVE INSTRUMENTS - Effect of Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Total $ (44) $ (4,322)
Interest rate contracts | Non-Utility Revenue    
Derivatives, Fair Value [Line Items]    
Losses reclassified from AOCL into income (12) (12)
SJG | Interest rate contracts | Non-Utility Revenue    
Derivatives, Fair Value [Line Items]    
Losses reclassified from AOCL into income (12) (12)
Derivatives not designated as hedging instruments under GAAP    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Gains (Losses) on energy-related commodity contracts (44) (276)
Gains (Losses) on interest rate contracts $ 0 $ (4,046)