EQUITY INVESTMENTS - Income From Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	$ 143,946	$ 22,831	$ 403,985	$ 65,877
Operating income	52,766	12,805	138,195	35,411
Net income	30,874	8,663	84,807	23,986
Net income attributable to investee	$ 23,565	$ 8,663	$ 63,347	$ 23,986