South Jersey Gas Company Statements of Changes in Common Equity and Comprehensive Income - USD ($) $ in Thousands	Total	AOCL	South Jersey Gas Company	South Jersey Gas Company Common Stock	South Jersey Gas Company Premium on Common Stock	South Jersey Gas Company AOCL	South Jersey Gas Company Retained Earnings
Beginning balance at Dec. 31, 2018			$ 1,008,022	$ 5,848	$ 355,744	$ (22,357)	$ 668,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	$ 76,917		87,394				87,394
Other Comprehensive Income (Loss), Net of Tax	(6,463)	$ (6,463)	(5,518)			(5,518)
Ending balance at Dec. 31, 2019			1,089,898	5,848	355,744	(27,875)	756,181
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	157,084		108,059				108,059
Additional Investment by Shareholder			109,500		109,500
Other Comprehensive Income (Loss), Net of Tax	(5,658)	(5,658)	(3,731)			(3,731)
Ending balance at Dec. 31, 2020	1,660,881		1,303,726	5,848	465,244	(31,606)	864,240
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	88,091		127,638				127,638
Additional Investment by Shareholder			40,000		40,000
Other Comprehensive Income (Loss), Net of Tax	11,487	$ 11,487	8,630			8,630
Ending balance at Dec. 31, 2021	$ 1,989,152		$ 1,479,994	$ 5,848	$ 505,244	$ (22,976)	$ 991,878