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STOCK-BASED COMPENSATION (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 02, 2015 USD ($) | May 31, 2017 shares | May 31, 2010 shares | Dec. 31, 2018 USD ($) stock_based_compensation_plan $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for purchase (in shares) | shares |  |  |  | 3,000,000 |  |
Number of stock-based compensation plans | stock_based_compensation_plan |  |  |  | 3 |  |
Share-based compensation expense recognized |  |  |  | $ 20,779 | $ 21,550 | $ 17,310
Dividend yield |  |  |  | 0.00% | 0.00% | 0.00%
Intrinsic value, options exercised |  |  |  | $ 16,900 | $ 16,200 | $ 9,700
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  | $ 21.78 | $ 16.95 | $ 12.48
Proceeds from exercised stock options |  |  |  | $ 9,392 | $ 9,774 | $ 10,481
Tax benefit realized from stock options exercised |  |  |  | 3,100 | 6,200 | 3,700
Capitalized share-based compensation cost |  |  |  | 400 | 500 | 500
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 |  |  |  | $ 0 | $ 300 | $ 700
2003 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares |  |  |  | 14,700,000 |  |
Increase in authorized shares (in shares) | shares |  | 1,700,000 | 3,500,000 |  |  |
2000 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares |  |  |  | 4,000,000 |  |
2001 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) | shares |  |  |  | 4,000,000.0 |  |
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 |  |
Shares available for purchase (in shares) | shares |  |  |  | 2,000,000 |  |
Shares issued (in shares) | shares |  |  |  | 16,721 | 12,168 | 12,494
ESPP proceeds received |  |  |  | $ 700 | $ 600 | $ 500
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |
Total unrecognized compensation costs related to unvested awards |  |  |  | $ 4,100 |  |
Weighted-average period for cost recognition, in years |  |  |  | 2 years |  |
Employee Stock Option | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  | 1 year |  |
Employee Stock Option | Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period, in years |  |  |  | 8 years |  |
Employee Stock Option | Directors and Certain Executive Officers | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period, in years |  |  |  | 6 years |  |
Employee Stock Option | Directors and Certain Executive Officers | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period, in years |  |  |  | 10 years |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |
Vested but not issued (in shares) | shares |  |  |  | 500,000 |  |
Restricted Stock, Performance Stock and Contract Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense recognized |  |  |  | $ 18,100 | 18,500 | 15,600
Total unrecognized compensation costs related to unvested awards |  |  |  | $ 20,200 |  |
Weighted-average period for cost recognition, in years |  |  |  | 2 years |  |
Fair value of shares vested |  |  |  | $ 24,800 | $ 22,200 | $ 16,200
Requisite service periods of performance stock, restricted stock and contract stock awards, in years |  |  |  | 3 years |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vested but not issued (in shares) | shares |  |  |  | 200,000 |  |

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