FINANCIAL INSTRUMENTS - Cash, Cash Equivalents and Restricted Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 52,763	$ 28,754
Restricted Investments	775	686
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	53,538	29,440	$ 25,449	$ 41,831
South Jersey Gas Company
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	1,331	3,360
Restricted Investments	725	686
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 2,056	$ 4,046	$ 2,020	$ 6,424