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STOCK-BASED COMPENSATION (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) $ / shares shares | Jul. 02, 2015 USD ($) | May 31, 2010 shares | Jul. 31, 2008 shares | Dec. 31, 2016 USD ($) stock_based_compensation_plan $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares | $ 41.78 |  |  |  |  |  |
Shares available for purchase (in shares) | shares | 2,200,000 |  |  |  | 2,200,000 |  |
Number of stock-based compensation plans | stock_based_compensation_plan |  |  |  |  | 3 |  |
Share-based compensation expense recognized |  |  |  |  | $ 17,310 | $ 15,450 | $ 14,554
Dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00%
Intrinsic value, options exercised |  |  |  |  | $ 9,700 | $ 5,800 | $ 7,700
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 12.48 | $ 8.59 | $ 9.08
Cash received from option exercises |  |  |  |  | $ 14,400 | $ 10,100 | $ 18,700
Capitalized compensation cost |  |  |  |  | 500 | 300 | 200
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation costs related to unvested awards | $ 4,000 |  |  |  | $ 4,000 |  |
Weighted-average period for cost recognition, in years |  |  |  |  | 2 years |  |
Restricted Stock, Performance Stock and Contract Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense recognized |  |  |  |  | $ 15,600 | 10,200 | 13,100
Total unrecognized compensation costs related to unvested awards | $ 14,800 |  |  |  | $ 14,800 |  |
Weighted-average period for cost recognition, in years |  |  |  |  | 2 years |  |
Fair value of shares vested |  |  |  |  | $ 16,200 | 19,900 | $ 9,400
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 |  |
Non issued vested restricted stock units (in shares) | shares | 400,000 |  |  |  | 400,000 |  |
Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non issued vested restricted stock units (in shares) | shares | 200,000 |  |  |  | 200,000 |  |
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SeaSpine Inc. |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Incremental increase in stock based award expense after spinoff |  | $ 4,400 |  |  |  |  |
Share-based compensation expense recognized |  |  |  |  | $ 700 | $ 3,300 |
Total unrecognized compensation costs related to unvested awards | $ 400 |  |  |  | $ 400 |  |
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options exercisable for officers and employees, vesting period, in years |  |  |  |  | 4 years |  |
Stock options exercisable for directors, vesting period, in years |  |  |  |  | 1 year |  |
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 |  |
2003 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares | 13,000,000 |  |  |  | 13,000,000 |  |
Increase in authorized shares (in shares) | shares |  |  | 3,500,000 | 1,500,000 |  |  |
2000 and 2001 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares | 4,000,000 |  |  |  | 4,000,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares | 3,000,000 |  |  |  | 3,000,000 |  |
Shares available for purchase (in shares) | shares | 2,100,000 |  |  |  | 2,100,000 |  |
Shares issued (in shares) | shares |  |  |  |  | 12,494 | 12,040 | 8,950
ESPP proceeds received |  |  |  |  | $ 500 | $ 400 | $ 200

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