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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 |  |

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