RETAINED EARNINGS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Amount of cash dividends declared to SJI	$ 40,700,000
Cash dividends paid to SJI	40,700,000
Equity infusions from SJI	$ 0	$ 25,000,000	$ 25,000,000