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DERIVATIVE INSTRUMENTS - Effect of Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Total $ (5,904) $ (7,324) $ (11,847) $ (22,362)
Fair value of derivative instruments with credit-risk-related features 300   300  
Additional collateral, aggregate fair value 100   100  
Interest rate contracts | Non-Utility Revenue        
Derivatives, Fair Value [Line Items]        
Losses reclassified from AOCL into income (12) (12) (35) (35)
SJG | Interest rate contracts | Non-Utility Revenue        
Derivatives, Fair Value [Line Items]        
Losses reclassified from AOCL into income (12) (12) (35) (35)
Derivatives not designated as hedging instruments under GAAP        
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gains (Losses) on energy-related commodity contracts (6,246) (6,187) (7,807) (18,390)
Gains (Losses) on interest rate contracts $ 342 $ (1,137) $ (4,040) $ (3,972)