FINANCIAL INSTRUMENTS - Cash, Cash Equivalents and Restricted Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 53,472	$ 28,754
Restricted Investments	2,241	686
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	55,713	29,440	$ 87,933	$ 41,831
South Jersey Gas Company
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	1,931	3,360
Restricted Investments	34	686
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 1,965	$ 4,046	$ 2,099	$ 6,424