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DERIVATIVE INSTRUMENTS - Outstanding Contracts (Details)
MWh in Millions, MMcfe in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
MWh
Mar. 31, 2020
USD ($)
MMcfe
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Energy Related Derivative          
Derivative [Line Items]          
Unrealized gains (losses)     $ (5,000,000.0)   $ (4,000,000.0)
Interest Rate Swap, $20,000,00 Contract 1          
Derivative [Line Items]          
Notional Amount $ 20,000,000 $ 20,000,000 $ 20,000,000    
Fixed Interest Rate 3.049% 3.049% 3.049%    
Interest Rate Swap, $20,000,000 Contract 2          
Derivative [Line Items]          
Notional Amount $ 20,000,000 $ 20,000,000 $ 20,000,000    
Fixed Interest Rate 3.049% 3.049% 3.049%    
Interest Rate Swap, $10,000,000          
Derivative [Line Items]          
Notional Amount $ 10,000,000 $ 10,000,000 $ 10,000,000    
Fixed Interest Rate 3.049% 3.049% 3.049%    
Basis and Index related net purchase (sale) contracts (in MMdts)          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh) | MMcfe   113.7      
Derivatives not designated as hedging instruments under GAAP          
Derivative [Line Items]          
Gain (loss) on energy related derivative instruments not designated as hedging instruments     $ (276,000) $ (12,060,000)  
Expected future purchases          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh) 0.4 79.0      
Expected future sales          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh) 0.3 82.1      
SJG | Energy Related Derivative          
Derivative [Line Items]          
Unrealized gains (losses)     900,000   $ 2,100,000
SJG | Interest Rate Swap, $12,500,000 Contract 1          
Derivative [Line Items]          
Notional Amount $ 12,500,000 $ 12,500,000 $ 12,500,000    
Fixed Interest Rate 3.53% 3.53% 3.53%    
SJG | Interest Rate Swap, $12,500,000 Contract 2          
Derivative [Line Items]          
Notional Amount $ 12,500,000 $ 12,500,000 $ 12,500,000    
Fixed Interest Rate 3.43% 3.43% 3.43%    
SJG | Expected future purchases          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh) 16.7      
SJG | Expected future sales          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh) 4.1      
SJG | Basis and Index related net purchase (sale) contracts (in MMdts)          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh) | MMcfe   1.3