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DERIVATIVE INSTRUMENTS - Effect of Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Interest Rate Contracts:    
Total $ (13,150) $ 24,981
Fair value of derivative instruments with credit-risk-related features 100  
Additional collateral, aggregate fair value 100  
Derivatives in Cash Flow Hedging Relationships under GAAP    
Interest Rate Contracts:    
Losses reclassified from AOCL into income (12) (12)
Derivatives in Cash Flow Hedging Relationships under GAAP | SJG    
Interest Rate Contracts:    
Losses reclassified from AOCL into income (12) (12)
Derivatives not designated as hedging instruments under GAAP    
Interest Rate Contracts:    
(Losses) gains on energy-related commodity contracts (12,060) 23,353
Gains (Losses) on interest rate contracts $ (1,090) $ 1,628