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DERIVATIVE INSTRUMENTS - EFFECTS OF DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest Rate Contracts [Abstract]      
Gains (losses) on energy-related commodity contracts $ 34,509 $ (13,667) $ 26,935
Gains (losses) on interest rate contracts 1,337 (677) 647
Total 35,846 (14,344) 27,582
Fair value derivative instruments with credit-risk-related features 1,000    
Additional collateral, aggregate fair value 200    
Designated as Hedging Instrument      
Interest Rate Contracts [Abstract]      
Losses reclassified from AOCL into income (46) (2,524) (333)
South Jersey Gas Company | Designated as Hedging Instrument      
Interest Rate Contracts [Abstract]      
Losses reclassified from AOCL into income $ (46) $ (46) $ (46)