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SHAREHOLDERS' EQUITY (Schedule of Stock Option Activity) (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number of options
Outstanding at January 1, 2017	2,273,664
Assumed	444,826
Exercised	(813,787)
Forfeited	(224,289)
Cancelled	(4,284)
Outstanding at December 31, 2017	1,676,130	2,273,664
Exercisable	598,843
Weighted average exercise price
Outstanding at January 1, 2017	$ 23.61
Granted	20.75
Exercised	23.35
Forfeited	22.85
Cancelled	15.00
Outstanding at December 31, 2017	23.07	$ 23.61
Exercisable	$ 33.38
Weighted-average remaining contractual term (in years)
Outstanding at December 31	4 years 5 months 16 days	4 years 5 months 12 days
Exercisable	3 years 5 months 12 days
Aggregate intrinsic value
Outstanding at January 1, 2017	$ 102,652
Outstanding at December 31, 2017	115,390	$ 102,652
Exercisable	$ 35,049

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Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract]

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Net number of share options (or share units) assumed during the period.

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Share based compensation arrangement by share based payment award options cancelled in period weighted average exercise price.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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