FINANCIAL INSTRUMENTS - CASH, CASH EQUIVALENTS, AND RESTRICTED CASH (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents	$ 28,754	$ 34,045
Restricted Investments	686	7,786
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	29,440	41,831	$ 28,381	$ 31,679
South Jersey Gas Company
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents	3,360	1,598
Restricted Investments	686	4,826
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 4,046	$ 6,424	$ 6,751	$ 3,262