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DERIVATIVE INSTRUMENTS - Outstanding Contracts (Details)
MWh in Millions, MMcfe in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
MMcfe
Jun. 30, 2020
USD ($)
MWh
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Energy Related Derivative              
Derivative [Line Items]              
Unrealized gains (losses)         $ (200,000)   $ (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 $ 20,000,000    
Fixed Interest Rate 3.049%   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 $ 20,000,000    
Fixed Interest Rate 3.049%   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 $ 10,000,000    
Fixed Interest Rate 3.049%   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     94.1        
Derivatives not designated as hedging instruments under GAAP              
Derivative [Line Items]              
Gain (loss) on energy related derivative instruments not designated as hedging instruments $ (1,285,000) $ (143,000)     $ (1,561,000) $ (12,203,000)  
Expected future purchases              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)     78.9 0.2      
Expected future sales              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)     84.0 0.2      
SJG | Energy Related Derivative              
Derivative [Line Items]              
Unrealized gains (losses)         2,200,000   $ 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 $ 12,500,000    
Fixed Interest Rate 3.53%   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 $ 12,500,000    
Fixed Interest Rate 3.43%   3.43% 3.43% 3.43%    
SJG | Expected future purchases              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)     10.2      
SJG | Expected future sales              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)     0.4      
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     2.5