Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Total South Jersey Industries, Inc. Equity	Common Stock	Premium on Common Stock	Treasury Stock	AOCL	Retained Earnings	NCI
Beginning balance at Dec. 31, 2018	$ 1,267,022	$ 1,267,022	$ 106,883	$ 843,268	$ (292)	$ (26,095)	$ 343,258	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	76,917	76,917					76,917
Other Comprehensive Income (Loss), Net of Tax	(6,463)	(6,463)				(6,463)
Common Stock Issued or Granted Through Equity Offering or Stock Plans	193,247	193,247	8,610	184,634	3
Cash Dividends Declared - Common Stock	(106,938)	(106,938)					(106,938)
Ending balance at Dec. 31, 2019	1,423,785	1,423,785	115,493	1,027,902	(289)	(32,558)	313,237	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	157,042	157,084					157,084	(42)
Other Comprehensive Income (Loss), Net of Tax	(5,658)	(5,658)				(5,658)		0
Common Stock Issued or Granted Through Equity Offering or Stock Plans	200,313	200,313	10,247	190,098	(32)
Cash Dividends Declared - Common Stock	(114,643)	(114,643)					(114,643)
Capital Contributions of Noncontrolling Interests in Subsidiaries	6,037	0						6,037
Ending balance at Dec. 31, 2020	1,666,876	1,660,881	125,740	1,218,000	(321)	(38,216)	355,678	5,995
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	88,565	88,091					88,091	474
Other Comprehensive Income (Loss), Net of Tax	11,487	11,487				11,487
Common Stock Issued or Granted Through Equity Offering or Stock Plans	431,507	431,507	20,935	410,538	34
Contract Liability Adjustment (see Note 6)	(69,478)	(69,478)		(69,478)				0
Cash Dividends Declared - Common Stock	(133,336)	(133,336)					(133,336)
Capital Contributions of Noncontrolling Interests in Subsidiaries	3,820	0						3,820
Ending balance at Dec. 31, 2021	$ 1,999,441	$ 1,989,152	$ 146,675	$ 1,559,060	$ (287)	$ (26,729)	$ 310,433	$ 10,289