FINANCIAL INSTRUMENTS - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 41,763	$ 30,582
Provision for expected credit losses	2,453	2,409
Regulated assets	4,044	4,134
Recoveries of accounts previously written off	79	230
Uncollectible accounts written off	(1,370)	(1,500)
Balance at end of period	46,969	35,855
South Jersey Gas Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	25,166	17,359
Provision for expected credit losses	1,834	1,760
Regulated assets	1,752	2,194
Recoveries of accounts previously written off	42	127
Uncollectible accounts written off	(428)	(967)
Balance at end of period	$ 28,366	$ 20,473