ACCUMULATED OTHER COMPREHENSIVE LOSS (AOCL) (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Loss (AOCL)

The following table presents the changes in SJI's AOCL, net of tax, for the years ended December 31, 2021, 2020, and 2019 (in thousands):

	Postretirement Liability Adjustment		Unrealized Gain (Loss) on Derivatives-Other		Unrealized Gain (Loss) on Available-for-Sale Securities		Other Comprehensive Income (Loss) of Affiliated Companies		Total
Balance at January 1, 2019	$	(25,626)	$	(362)	$	(10)	$	(97)	$	(26,095)
Other comprehensive loss before reclassifications	(6,498)		—		—		—		(6,498)
Amounts reclassified from AOCL	—		35		—		—		35
Net current period other comprehensive (loss) income	(6,498)		35		—		—		(6,463)
Balance at December 31, 2019	(32,124)		(327)		(10)		(97)		(32,558)
Other comprehensive loss before reclassifications	(5,692)		—		—		—		(5,692)
Amounts reclassified from AOCL	—		34		—		—		34
Net current period other comprehensive (loss) income	(5,692)		34		—		—		(5,658)
Balance at December 31, 2020	(37,816)		(293)		(10)		(97)		(38,216)
Other comprehensive income before reclassifications	11,455		—		—		—		11,455
Amounts reclassified from AOCL	—		32		—		—		32
Net current period other comprehensive income	11,455		32		—		—		11,487
Balance at December 31, 2021	$	(26,361)	$	(261)	$	(10)	$	(97)	$	(26,729)

The following table presents the changes in SJG's AOCL, net of tax, for the years ended December 31, 2021, 2020, and 2019 (in thousands):

	Postretirement Liability Adjustment		Unrealized Gain (Loss) on Derivatives-Other		Total
Balance at January 1, 2019	$	(21,901)	$	(456)	$	(22,357)
Other comprehensive loss before reclassifications	(5,553)		—		(5,553)
Amounts reclassified from AOCL	—		35		35
Net current period other comprehensive (loss) income	(5,553)		35		(5,518)
Balance at December 31, 2019	(27,454)		(421)		(27,875)
Other comprehensive loss before reclassifications	(3,765)		—		(3,765)
Amounts reclassified from AOCL	—		34		34
Net current period other comprehensive (loss) income	(3,765)		34		(3,731)
Balance at December 31, 2020	(31,219)		(387)		(31,606)
Other comprehensive income before reclassifications	8,598		—		8,598
Amounts reclassified from AOCL	—		32		32
Net current period other comprehensive income	8,598		32		8,630
Balance at December 31, 2021	$	(22,621)	$	(355)	$	(22,976)