RATES AND REGULATORY ACTIONS (Details) - South Jersey Gas Company - USD ($) $ in Thousands		1 Months Ended
	Nov. 01, 2017	Sep. 30, 2017	Jul. 31, 2017	Jun. 30, 2017	Apr. 30, 2017	Jan. 31, 2017
Energy Efficiency Tracker
Schedule of Capitalization [Line Items]
Budget for energy efficiency program						$ 36,300
New Jersey Board of Public Utilities | Subsequent event
Schedule of Capitalization [Line Items]
Approved rate increase (decrease), amount	$ 39,500
Approved rate increase (decrease), percentage	6.80%
Approved return on equity, percentage	9.60%
AIRP II Investments | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease), amount		$ 5,000
Property, plant and equipment		46,100
SHARP Investments | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Approved rate increase (decrease), amount		3,600
Property, plant and equipment		33,300
Annual SBC Filing | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Public utilities, requested rate increase (decrease), amount			$ (8,000)
Annual SBC File- USF Component | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Public utilities, requested rate increase (decrease), amount		2,000
EET Rate Adjustment Petition | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Public utilities, requested rate increase (decrease), amount				$ (3,000)
Annual BGSS Filing | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Public utilities, bill credit					$ 8,000
Public utilities, requested rate increase (decrease), amount		4,700
Annual CIP Filing | New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Public utilities, requested rate increase (decrease), amount		$ (200)