DISCONTINUED OPERATIONS - Operating Results of Discontinued Operations (Details) - PBM Services - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 0	$ 11,585	$ 0	$ 44,375
Gross profit	0	2,405	0	9,763
Other operating expenses, net	293	2,567	(220)	12,496
Bad debt expense	0	0	0	(46)
Gain on sale before income taxes	0	(11,424)	0	(11,424)
Other income and expenses, net	0	2,180	0	2,181
Income (loss) before income taxes	(293)	9,082	220	6,556
Income tax provision	(119)	1,384	86	1,384
Total income (loss) from discontinued operations, net of income taxes	$ (174)	$ 7,698	$ 134	$ 5,172