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NET INCOME (LOSS) PER SHARE (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 15, 2016 | Jul. 02, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Allocated share-based compensation expense |  |  | $ 17,310 | $ 15,450 | $ 14,554
Shares excluded from computation as their effect would be antidilutive (in shares) |  |  | 200 | 200 | 400
Stock issued during period, shares, conversion of convertible securities (in shares) | 2,900 |  |  |  |
Common stock from the exercise of call option with hedge participants (in shares) | 2,900 |  | 2,946 |  |
Common Stock |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock issued during period, shares, conversion of convertible securities (in shares) | 2,900 |  | 2,946 |  |
Performance Shares and Restricted Units |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Additional EPS shares |  |  | 600 |  |
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 |  |  | $ 700 | $ 3,300 |
Compensation cost not yet recognized |  |  | $ 400 |  |

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