MARKETABLE SECURITIES - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Marketable Securities [Abstract]
Increase (Decrease) in Trading Securities	$ 21,700,000
Trading Securities, Debt			$ 0.0	$ 0.0
Net Realized and Unrealized Gain (Loss) on Trading Securities	$ (800,000)	$ 5,600,000