Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Revenues:
Utility	$ 918,428	$ 896,874	$ 670,715
Nonutility	622,955	731,752	970,623
Total Operating Revenues	1,541,383	1,628,626	1,641,338
Operating Expenses:
Operations	233,314	238,752	256,862
Impairment Charges	0	10,745	105,280
Maintenance	38,857	37,341	32,162
Depreciation	118,715	99,753	96,723
Energy and Other Taxes	11,918	11,996	9,537
Net Gain on Sales of Assets	(2,578)	(3,133)	(15,379)
Total Operating Expenses	1,259,161	1,427,421	1,540,593
Operating Income (Loss)	282,222	201,205	100,745
Other Income and Expense	7,979	4,208	2,404
Interest Charges	(118,534)	(114,477)	(90,296)
Income Before Income Taxes	171,667	90,936	12,853
Income Taxes	(22,664)	(21,061)	(561)
Equity in Earnings of Affiliated Companies	8,294	7,314	5,611
Income from Continuing Operations	157,297	77,189	17,903
Loss from Discontinued Operations - (Net of tax benefit)	(255)	(272)	(240)
Net Income	157,042	76,917	17,663
Add: Loss Attributable to Noncontrolling Interest	(42)	0	0
Net Income Attributable to South Jersey Industries, Inc.	$ 157,084	$ 76,917	$ 17,663
Basic Earnings per Common Share:
Continuing Operations (in USD per share)	$ 1.62	$ 0.84	$ 0.21
Discontinued Operations (in USD per share)	0	0	0
Net Income (in USD per share)	$ 1.62	$ 0.84	$ 0.21
Average Shares of Common Stock Outstanding - Basic (in shares)	96,854	92,130	83,693
Diluted Earnings per Common Share:
Continuing Operations (in USD per share)	$ 1.62	$ 0.84	$ 0.21
Discontinued Operations (in USD per share)	0	0	0
Net Income (in USD per share)	$ 1.62	$ 0.84	$ 0.21
Average Shares of Common Stock Outstanding - Diluted (in shares)	96,995	92,253	84,471
South Jersey Gas Company
Operating Revenues:
Total Operating Revenues	$ 571,787	$ 569,226	$ 548,000
Operating Expenses:
Cost of Sales - (Excluding depreciation and amortization)	181,262	211,344	209,649
Operations	108,990	108,638	112,920
Maintenance	34,287	30,899	28,742
Depreciation	71,026	65,965	59,755
Energy and Other Taxes	4,987	4,886	4,246
Total Operating Expenses	400,552	421,732	415,312
Operating Income (Loss)	171,235	147,494	132,688
Other Income and Expense	5,536	4,376	4,685
Interest Charges	(33,388)	(31,654)	(28,011)
Income Before Income Taxes	143,383	120,216	109,362
Income Taxes	(35,324)	(32,822)	(26,413)
Net Income Attributable to South Jersey Industries, Inc.	108,059	87,394	82,949
Utility
Operating Expenses:
Cost of Sales - (Excluding depreciation and amortization)	297,094	351,284	258,781
Nonutility
Operating Expenses:
Cost of Sales - (Excluding depreciation and amortization)	$ 561,841	$ 680,683	$ 796,627