FINANCIAL INSTRUMENTS - SCHEDULE OF ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 30,582	$ 19,829
Provision for expected credit losses	10,159	9,558	$ 10,432
Regulatory assets	7,012	10,953
Recoveries of accounts previously written off	592	909
Uncollectible accounts written off	(6,582)	(10,667)
Balance at end of period	41,763	30,582	19,829
South Jersey Gas Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	17,359	14,032
Provision for expected credit losses	7,794	6,209
Regulatory assets	3,119	4,845
Recoveries of accounts previously written off	160	424
Uncollectible accounts written off	(3,266)	(8,151)
Balance at end of period	$ 25,166	$ 17,359	$ 14,032