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STOCK-BASED COMPENSATION (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2015 USD ($) | May. 31, 2010 shares | Jul. 31, 2008 shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 USD ($) stock_based_compensation_plan $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for purchase (in shares) | shares |  |  |  | 1,400,000 | 1,400,000 |  |
Number of stock-based compensation plans | stock_based_compensation_plan |  |  |  |  | 3 |  |
Dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00%
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 17.17 | $ 18.15 | $ 13.86
Cash received from option exercises |  |  |  |  | $ 7,300 | $ 15,200 | $ 2,300
Share-based compensation expense recognized |  |  |  |  | $ 15,450 | 14,554 | 9,842
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options exercisable for officers, directors and employees, vesting period, in years |  |  |  |  | 4 years |  |
Stock options exercisable for directors, expiration period, in years |  |  |  |  | 6 years |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options exercisable for employees, expiration period, in years |  |  |  |  | 6 years |  |
Stock options exercisable for directors, expiration period, in years |  |  |  |  | 10 years |  |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average period for cost recognition, in years |  |  |  |  | 2 years |  |
Total unrecognized compensation costs related to unvested awards |  |  |  | $ 2,300 | $ 2,300 |  |
Restricted Stock, Performance Stock and Contract Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average period for cost recognition, in years |  |  |  |  | 2 years |  |
Total unrecognized compensation costs related to unvested awards |  |  |  | $ 13,900 | $ 13,900 |  |
Share-based compensation expense recognized |  |  |  |  | 10,200 | 13,100 | 8,600
Fair value of shares vested |  |  |  |  | $ 19,900 | $ 9,400 | $ 6,500
Requisite service periods of performance stock, restricted stock and contract stock awards, in years |  |  |  |  | 3 years |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |
Restricted Stock Units (RSUs) | Non Former Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non issued vested restricted stock units (in shares) | shares |  |  |  | 300,000 | 300,000 |  |
2000 and 2001 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares |  |  |  | 2,000,000 | 2,000,000 |  |
2003 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares |  |  |  | 6,500,000 | 6,500,000 |  |
Increase in authorized shares (in shares) | shares |  | 1,750,000 | 750,000 |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares |  |  |  | 1,500,000 | 1,500,000 |  |
Shares available for purchase (in shares) | shares |  |  |  | 1,000,000 | 1,000,000 |  |
Shares issued (in shares) | shares |  |  |  |  | 6,020 | 3,889 | 4,855
ESPP proceeds received |  |  |  |  | $ 400 | $ 200 | $ 200
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SeaSpine Inc. |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, plan modification, incremental compensation cost | $ 4,400 |  |  |  |  |  |
Total unrecognized compensation costs related to unvested awards |  |  |  | $ 1,100 | 1,100 |  |
Share-based compensation expense recognized |  |  |  | $ 3,300 | $ 3,300 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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