Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Results

(Summarized quarterly results of SJI's and SJG's operations, in thousands except for per share amounts)

	2020 Quarter Ended								2019 Quarter Ended
SJI (includes SJG and all other consolidated subsidiaries):	March 31		June 30		Sept. 30		Dec. 31		March 31		June 30		Sept. 30		Dec. 31
Operating Revenues	$	534,112	$	259,964	$	261,549	$	485,758	$	637,298	$	266,934	$	261,203	$	463,191
Expenses:
Cost of Sales - (Excluding depreciation)	266,068		147,653		176,029		269,185		402,387		165,341		190,366		273,873
Operations, Impairment Charges, Net Gains on Sale of Assets, Depreciation and Maintenance Including Interest Charges	130,956		118,073		119,046		138,767		124,794		118,444		116,056		138,641
Income Taxes	33,370		(178)		(19,467)		8,939		24,949		(4,646)		(10,925)		11,683
Energy and Other Taxes	3,862		2,636		2,730		2,690		4,217		2,717		2,663		2,399
Total Expenses	434,256		268,184		278,338		419,581		556,347		281,856		298,160		426,596
Other Income and Expense & Equity in Earnings of Affiliated Companies	1,244		5,642		6,445		2,942		4,748		1,618		2,211		2,945
Income (Loss) from Continuing Operations	101,100		(2,578)		(10,344)		69,119		85,699		(13,304)		(34,746)		39,540
Loss from Discontinued Operations  -  (Net of tax benefit)	(59)		(61)		(58)		(77)		(62)		(95)		(59)		(56)
Net Income (Loss)	$	101,041	$	(2,639)	$	(10,402)	$	69,042	$	85,637	$	(13,399)	$	(34,805)	$	39,484
Basic Earnings (Loss) Per Common Share:
Continuing Operations	$	1.09	$	(0.03)	$	(0.10)	$	0.69	$	0.94	$	(0.14)	$	(0.38)	$	0.43
Discontinued Operations	—		—		—		—		—		—		—		—
Basic Earnings (Loss) Per Common Share	$	1.09	$	(0.03)	$	(0.10)	$	0.69	$	0.94	$	(0.14)	$	(0.38)	$	0.43
Average Shares of Common Stock Outstanding - Basic	92,445		93,712		100,587		100,590		91,332		92,389		92,392		92,130
Diluted Earnings (Loss) Per Common Share:
Continuing Operations	$	1.09	$	(0.03)	$	(0.10)	$	0.69	$	0.94	$	(0.14)	$	(0.38)	$	0.43
Discontinued Operations	—		—		—		—		—		—		—		—
Diluted Earnings (Loss) Per Common Share	$	1.09	$	(0.03)	$	(0.10)	$	0.69	$	0.94	$	(0.14)	$	(0.38)	$	0.43
Average Shares of Common Stock Outstanding - Diluted	92,556		93,712		100,587		100,780		91,432		92,389		92,392		92,253
	2020 Quarter Ended								2019 Quarter Ended
SJG:	March 31		June 30		Sept. 30		Dec. 31		March 31		June 30		Sept. 30		Dec. 31
Operating Revenues	$	240,694	$	87,182	$	66,190	$	177,721	$	272,198	$	62,268	$	62,039	$	172,721

Expenses:
Cost of Sales (excluding depreciation)	80,534		25,546		20,575		54,607		118,880		2,654		19,268		70,542
Operations, Depreciation and Maintenance Including Fixed Charges	61,442		58,853		58,772		68,624		60,832		56,141		57,771		62,412
Income Taxes	25,231		1,219		(3,293)		12,167		23,697		671		(3,747)		12,201
Energy and Other Taxes	1,615		1,070		1,194		1,108		1,989		1,154		1,159		584
Total Expenses	168,822		86,688		77,248		136,506		205,398		60,620		74,451		145,739
Other Income and Expense (See Note 1)	(1,350)		3,184		1,515		2,187		1,931		328		808		1,309
Net Income (Loss)	$	70,522	$	3,678	$	(9,543)	$	43,402	$	68,731	$	1,976	$	(11,604)	$	28,291