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