SHARE INCENTIVE PLANS: (Details 5) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based compensation expense
Total share-based compensation expense	$ 71,118	$ 50,764	$ 47,235
Total unrecognized share-based compensation costs related to non-vested awards	$ 121,200
Weighted average period for recognition of unrecognized share-based compensation costs (in years)	2 years 9 months 18 days
Employee stock option [Member]
Share-based compensation expense
Total share-based compensation expense	$ 2,711	6,680	8,974
ESPP [Member]
Share-based compensation expense
Total share-based compensation expense	6,394	4,007	3,976
Restricted Stock Units (RSUs) [Member]
Share-based compensation expense
Total share-based compensation expense	62,013	40,077	34,285
Cost of sales [Member]
Share-based compensation expense
Total share-based compensation expense	2,375	2,366	2,162
Research and development expense [Member]
Share-based compensation expense
Total share-based compensation expense	40,475	28,821	26,979
Sales and marketing [Member]
Share-based compensation expense
Total share-based compensation expense	15,183	10,309	9,755
General and administrative expense [Member]
Share-based compensation expense
Total share-based compensation expense	13,085	$ 9,268	$ 8,339
EZchip [Member]
Share-based compensation expense
Share-based compensation	$ 4,800

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Amount of cash paid related to share-based compensation liabilities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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