Proceeds received from employees in connection with the employee stock purchase plan.

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The increase in the number of authorized shares under the Plan.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Vested But Not Issued In Period

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Number of share instruments newly issued under a share-based compensation plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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STOCK-BASED COMPENSATION (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Jul. 02, 2015 USD ($)	May 31, 2017 shares	May 31, 2010 shares	Dec. 31, 2017 USD ($) stock_based_compensation_plan $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase (in shares) \| shares				3,400,000
Number of stock-based compensation plans \| stock_based_compensation_plan				3
Share-based compensation expense recognized				$ 21,550	$ 17,310	$ 15,450
Dividend yield				0.00%	0.00%	0.00%
Intrinsic value, options exercised				$ 16,200	$ 9,700	$ 5,800
Weighted average grant date fair value of options granted (in dollars per share) \| $ / shares				$ 16.95	$ 12.48	$ 8.59
Proceeds from exercised stock options				$ 9,774	$ 10,481	$ 7,345
Tax benefit realized from stock options exercised				6,200	3,700	2,200
Capitalized share-based compensation cost				500	500	300
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				300	$ 700	$ 3,300
Total unrecognized compensation costs related to unvested awards				$ 100
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
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				2,100,000
Shares issued (in shares) \| shares				12,168	12,494	12,040
ESPP proceeds received				$ 600	$ 500	$ 400
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				$ 4,000
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				6 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				$ 18,500	15,600	10,200
Total unrecognized compensation costs related to unvested awards				$ 16,900
Weighted-average period for cost recognition, in years				2 years
Fair value of shares vested				$ 22,200	$ 16,200	$ 19,900
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