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DERIVATIVE INSTRUMENTS - Effect of Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivatives Not Designated as Hedging Instruments under GAAP        
Gains (losses) on energy-related commodity contracts     $ (15,300) $ (1,600)
Total $ (15,230) $ (1,621) (15,274) (5,943)
Interest rate contracts | Non-Utility Revenue        
Derivatives, Fair Value [Line Items]        
Losses reclassified from AOCL into income (12) (12) (24) (24)
SJG | Interest rate contracts | Non-Utility Revenue        
Derivatives, Fair Value [Line Items]        
Losses reclassified from AOCL into income (12) (12) (24) (24)
Derivatives not designated as hedging instruments under GAAP        
Derivatives Not Designated as Hedging Instruments under GAAP        
Gains (losses) on energy-related commodity contracts (15,230) (1,285) (15,274) (1,561)
Gains (losses) on interest rate contracts $ 0 $ (336) $ 0 $ (4,382)