DERIVATIVE INSTRUMENTS - Offsetting Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Energy-related commodity contracts
Offsetting Derivative Assets
Gross amounts of recognized assets/liabilities	$ 202,235	$ 117,529
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	202,235	117,529
Gross amounts not offset in the balance sheet, financial instruments	(73,066)	(57,804)
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	(75,456)	(32,782)
Net amount	53,713	26,943
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(128,139)	(76,081)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(128,139)	(76,081)
Gross amounts not offset in the balance sheet, financial instruments	73,066	57,804
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	(55,073)	(18,277)
Energy-related commodity contracts | South Jersey Gas Company
Offsetting Derivative Assets
Gross amounts of recognized assets/liabilities	33,244	9,903
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	33,244	9,903
Gross amounts not offset in the balance sheet, financial instruments	(5)	(1,780)
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	(16,084)	0
Net amount	17,155	8,123
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(595)	(2,844)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(595)	(2,844)
Gross amounts not offset in the balance sheet, financial instruments	5	1,780
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	(590)	(1,064)
Other
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(6,017)	(8,000)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(6,017)	(8,000)
Gross amounts not offset in the balance sheet, financial instruments	0	0
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	(6,017)	(8,000)
Other | South Jersey Gas Company
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(6,017)	(8,000)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(6,017)	(8,000)
Gross amounts not offset in the balance sheet, financial instruments	0	0
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	$ (6,017)	$ (8,000)