GOODWILL AND INTANGIBLE ASSETS - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 308,729	$ 573,323
Impairment	0	(251,850)	$ 0
Disposition of PBM Services		(12,744)
Acquisition of Home Solutions	57,218
Goodwill, ending balance	$ 365,947	$ 308,729	$ 573,323