Maximum employee contribution as percentage of the employee's net income, under the ESPP.

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Percentage rate of the closing price for the shares on the respective offering date used to calculate the option purchase price per shareas related to the employee share option plan.

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Percentage rate of the closing price for the shares on the respective offering date used to calculate the purchase price per share in regards to the employee stock purchase plan.

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Incremental expense for repricing of options.

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Number of Stock Options repriced during period.

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The total number of exercisable options for that are in the money and for which intrinsic value was calculated.

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The total number of outstanding options for that are in the money and for which intrinsic value was calculated.

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Aggregate number of common shares reserved for future issuance.

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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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The cash outflow to reacquire common stock during the period.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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No definition available.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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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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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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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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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2016	Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares repurchased	$ 21,980	$ 52,896	$ 15,169
Number of stock options repriced during period	667,750
Incremental expense for repricing of options	$ 1,187
Expense recognized from repricing of stock options	$ 359
Share capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased	1,884,030	2,824,772	887,855
Treasury stock, at cost [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of shares, authorized amount				$ 40,000	$ 40,000
2010 Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	2,000,000
Shares available for future grant	1,744,440
ESPP, purchase price as a percentage of market price	90.00%
Maximum employee contribution as a percentage of net income	10.00%
February 2010 Addendum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee share option plan, option purchase price as a percentage of market price	90.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Total unrecognized compensation costs	$ 12,570
Unrecognized compensation costs, period of recognition	1 year 8 months 1 day
Weighted average fair value at grant date of non-vested shares	$ 12.79	$ 18.36	$ 16.96
Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	5 years 2 months 12 days
Ordinary shares reserved for future issuance	28,445,714
Shares available for future grant	1,025,066
In-the-money options outstanding	3,925,483
In-the-money options exercisable	982,890
Weighted-average grant-date fair value of options granted	$ 3.48	$ 5.29	$ 5.42
Total unrecognized compensation costs	$ 10,612	$ 9,866	$ 10,643
Unrecognized compensation costs, period of recognition	1 year 7 months 13 days	1 year 7 months 6 days	1 year 6 months 11 days
Total fair value of vested options	$ 10,281	$ 9,696	$ 6,841
Stock Option Plans [Member] \| February 2010 Addendum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares reserved for future issuance	1,000,000
Shares available for future grant	763,306
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years