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DERIVATIVE INSTRUMENTS - Outstanding Contracts (Details)
MWh in Millions, MMcfe in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
MMcfe
Sep. 30, 2019
USD ($)
MWh
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]              
Unrealized gains (losses)     $ 600,000       $ 4,100,000
Interest Rate Swap, $20,000,00 Contract 1              
Derivative [Line Items]              
Derivative, 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]              
Derivative, 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]              
Derivative, 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       32.1      
Derivatives not designated as hedging instruments under GAAP              
Derivative [Line Items]              
Gain (loss) on energy related derivative instruments not designated as hedging instruments $ (6,187,000) $ (11,225,000) $ (18,390,000)     $ 5,950,000  
Expected future purchases              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)       112.8 0.8    
Expected future sales              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)       116.8 0.7    
SJG              
Derivative [Line Items]              
Unrealized gains (losses)     5,900,000       $ 3,300,000
SJG | Interest Rate Swap, $12,500,000 Contract 1              
Derivative [Line Items]              
Derivative, 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]              
Derivative, 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)       42.1 0.0    
SJG | Expected future sales              
Derivative [Line Items]              
Notional amount (natural gas in mmcfe and electricity in mwh)       29.6 0.0    
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       0.1