FAIR VALUE MEASUREMENTS - Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Combination, Acquisition Related Contingent Consideration [Roll Forward]
Increase from revaluation of contingent consideration	$ 2,789	$ 120	$ 5,485	$ 120
Recurring basis
Business Combination, Acquisition Related Contingent Consideration [Roll Forward]
Beginning Balance			59,021
Ending Balance	86,377		86,377
Recurring basis | Level 3
Business Combination, Acquisition Related Contingent Consideration [Roll Forward]
Beginning Balance			59,021
Increase from revaluation of contingent consideration			5,485
Acquisition of L-UDCA			25,000
Contractual payments			(1,510)
Contractual payments accrued at June 30, 2016			(1,677)
Foreign currency impact			58
Ending Balance	$ 86,377		$ 86,377