DERIVATIVE INSTRUMENTS - Offsetting Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Energy-related Commodity Contracts
Offsetting Derivative Assets
Gross amounts of recognized assets/liabilities	$ 239,587	$ 117,529
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	239,587	117,529
Gross amounts not offset in the balance sheet, financial instruments	(128,106)	(57,804)
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	(28,918)	(32,782)
Net amount	82,563	26,943
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(199,164)	(76,081)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(199,164)	(76,081)
Gross amounts not offset in the balance sheet, financial instruments	128,106	57,804
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	(71,058)	(18,277)
Energy-related Commodity Contracts | SJG
Offsetting Derivative Assets
Gross amounts of recognized assets/liabilities	33,969	9,903
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	33,969	9,903
Gross amounts not offset in the balance sheet, financial instruments	(4,620)	(1,780)
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	29,349	8,123
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(9,972)	(2,844)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(9,972)	(2,844)
Gross amounts not offset in the balance sheet, financial instruments	4,620	1,780
Gross amounts not offset in the balance sheet, cash collateral posted/(received)	0	0
Net amount	(5,352)	(1,064)
Other
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(2,861)	(8,000)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(2,861)	(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	(2,861)	(8,000)
Other | SJG
Offsetting Derivative Liabilities
Gross amounts of recognized assets/liabilities	(2,861)	(8,000)
Gross amount offset in the balance sheet	0	0
Net amounts of assets/liabilities in balance sheet	(2,861)	(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	$ (2,861)	$ (8,000)