DERIVATIVE INSTRUMENTS - INTEREST RATE SWAPS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Unrealized (loss) on derivatives	$ 0	$ (4,760,000)	$ 2,798,000
Interest rate contract
Derivative [Line Items]
Fair value of interest rate derivatives terminated		8,200,000
South Jersey Gas Company | Interest Rate Swap, 12,500,000, Contract 1
Derivative [Line Items]
Notional Amount	$ 12,500,000
Fixed Interest Rate	3.53%
South Jersey Gas Company | Interest Rate Swap, 12,500,000, Contract 2
Derivative [Line Items]
Notional Amount	$ 12,500,000
Fixed Interest Rate	3.43%
South Jersey Gas Company | Interest rate contract
Derivative [Line Items]
Unrealized (loss) on derivatives	$ 8,000,000	$ 9,900,000