South Jersey Gas Company Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Comprehensive Income (Loss), Net of Tax:
Postretirement Liability Adjustment, tax	$ (4,426)	$ 2,316	$ 2,539
Reclassification of Unrealized Gain on Derivatives - Other to Net Income, tax	(14)	(12)	(11)
South Jersey Gas Company
Other Comprehensive Income (Loss), Net of Tax:
Postretirement Liability Adjustment, tax	(3,352)	1,482	2,241
Reclassification of Unrealized Gain on Derivatives - Other to Net Income, tax	$ (14)	$ (12)	$ (11)