NET INCOME (LOSS) PER SHARE (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions			12 Months Ended
	Dec. 15, 2016	Jul. 02, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Allocated share-based compensation expense			$ 21,550	$ 17,310	$ 15,450
Shares excluded from computation as their effect would be antidilutive (in shares)			0.2	0.2	0.2
Stock issued during period, shares, conversion of convertible securities (in shares)	2.9
Common stock from the exercise of call option with hedge participants (in shares)	2.9
Performance Shares and Restricted Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Additional EPS shares			0.5
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SeaSpine Inc.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Increase in incremental fair value, stock-based compensation awards		$ 4,400
Allocated share-based compensation expense			$ 300	$ 700	$ 3,300
Compensation cost not yet recognized			$ 100