EQUITY INVESTMENTS - Income From Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Representation of investee financial information in the summarized equity method investments (as a percent)			100.00%
INCOME STATEMENT DATA:
Revenue	$ 22,831	$ 24,440	$ 65,877	$ 68,786
Costs and expenses	(10,026)	(16,642)	(30,466)	(43,256)
Non-operating expenses	(4,142)	(4,033)	(11,425)	(11,690)
Net income	$ 8,663	$ 3,765	$ 23,986	$ 13,840