FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - SCHEDULE OF CHANGES IN LEVEL 3 ASSETS AND LIABILITIES MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Contingent Consideration Arrangements
Contingent Consideration Arrangements
Balance at beginning of the period	$ (30,140)	$ (45,828)
Fair value adjustments	15,461	13,367
Foreign currency exchange gains	626	0
Foreign currency exchange gains	1,872	3,025
Fair value at date of acquisition	(27,442)	(8,813)
Settlements	5,750	8,109
Balance at end of the period	(33,873)	(30,140)
Auction Rate Security
Auction Rate Security
Balance at beginning of the period	6,070	8,920
Fair value adjustments	0	0
Foreign currency exchange gains	0	0
Included in other comprehensive (loss) income	(2,020)	(2,850)
Fair value at date of acquisition	0	0
Settlements	0	0
Balance at end of the period	$ 4,050	$ 6,070