Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 129,344	$ 128,727
Other Comprehensive Income - Net of Tax:
Reclassification of Unrealized Gain on Derivatives - Other to Net Income, net of tax	9	8
Other Comprehensive Income - Net of Tax	9	8
Comprehensive Income	129,353	128,735
Less: Comprehensive Income Attributable to Noncontrolling Interests	135	129
Comprehensive Income Attributable to South Jersey Industries, Inc.	$ 129,218	$ 128,606