BUSINESS COMBINATION: (Details) (USD $)	12 Months Ended			1 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 15, 2013	Jul. 02, 2013	Aug. 15, 2013	Feb. 07, 2011
Details of purchase consideration
Compensation expense	$ 45,138,000	$ 35,019,000	$ 21,412,000
Compensation expenses recognition period	2 years 3 months 25 days
Purchase price allocation:
Intangible assets	44,746,000
Goodwill	199,196,000	132,885,000
Restricted Stock
Details of purchase consideration
Units issued (in shares)	1,162,133	1,110,230	1,143,142
Fair value (in dollars per share)	$ 49.05	$ 42.88	$ 27.00
Compensation expense	28,740,000	18,064,000	7,158,000
Weighted average assumptions
Share value (in dollars per share)	$ 49.05	$ 42.88	$ 27.00
Share options
Details of purchase consideration
Fair value (in dollars per share)	$ 39.97	$ 59.38
Compensation expense	12,460,000	14,104,000	12,568,000
Weighted average assumptions
Expected life	4 years 8 months 19 days	6 years 3 months	6 years 3 months
Volatility (as a percent)	57.50%	56.60%	55.90%
Risk-free interest rate (as a percent)	1.54%	1.02%	1.72%
Share value (in dollars per share)	$ 39.97	$ 59.38
IPtronics and Kotura
Details of purchase consideration
Cash Consideration Paid				125,697,000
Cash Assumed				2,178,000
Net Cash Paid				123,519,000
Purchase price allocation:
Current assets, net of cash	8,140,000
Other long-term assets	11,577,000
Intangible assets	44,746,000
Goodwill	66,311,000
Total assets	130,774,000
Current liabilities	(6,025,000)
Long-term liabilities	(1,230,000)
Total liabilities	(7,255,000)
Total preliminary purchase price allocation	123,519,000
IPtronics
Details of purchase consideration
Cash Consideration Paid					44,925,000
Cash Assumed	2,077,000				2,077,000
Net Cash Paid	42,848,000				42,848,000
Purchase price allocation:
Current assets, net of cash					2,534,000
Other long-term assets					974,000
Intangible assets					17,229,000
Goodwill					25,630,000
Total assets					46,367,000
Current liabilities					(2,668,000)
Long-term liabilities					(851,000)
Total liabilities					(3,519,000)
Total preliminary purchase price allocation					42,848,000
IPtronics | Restricted Stock
Details of purchase consideration
Units issued (in shares)					60,508
Aggregate value					3,000,000
Fair value (in dollars per share)					$ 49.92
Compensation expense					3,000,000
Vesting period					4 years
Weighted average assumptions
Share value (in dollars per share)					$ 49.92
Kotura
Details of purchase consideration
Cash Consideration Paid						80,772,000
Cash Assumed	101,000					101,000
Net Cash Paid	80,671,000					80,671,000
Purchase price allocation:
Current assets, net of cash				5,606,000		5,606,000
Other long-term assets				10,603,000		10,603,000
Intangible assets				27,517,000		27,517,000
Goodwill				40,681,000		40,681,000
Total assets				84,407,000		84,407,000
Current liabilities				(3,357,000)		(3,357,000)
Long-term liabilities				(379,000)		(379,000)
Total liabilities				(3,736,000)		(3,736,000)
Total preliminary purchase price allocation				80,671,000		80,671,000
Kotura | RSUs and options
Details of purchase consideration
Aggregate value						6,400,000
Compensation expense						6,400,000
Kotura | RSUs and options | Minimum
Details of purchase consideration
Compensation expenses recognition period						1 day
Kotura | RSUs and options | Maximum
Details of purchase consideration
Compensation expenses recognition period						4 years
Kotura | Restricted Stock
Details of purchase consideration
Units issued (in shares)						145,425
Fair value (in dollars per share)				$ 42.19		$ 42.19
Weighted average assumptions
Share value (in dollars per share)				$ 42.19		$ 42.19
Kotura | Share options
Details of purchase consideration
Options issues (in shares)						31,653
Weighted average assumptions
Expected life						4 years 8 months 19 days
Volatility (as a percent)						57.50%
Risk-free interest rate (as a percent)						1.54%
Dividend yield (as a percent)						0.00%
Voltaire Ltd
Details of purchase consideration
Cash Assumed			3,961,000
Net Cash Paid			203,704,000
Purchase price allocation:
Current assets, net of cash							52,131,000
Other long-term assets							10,875,000
Intangible assets							36,052,000
Goodwill							132,885,000
Total assets							231,943,000
Current liabilities							(11,369,000)
Long-term liabilities							(6,606,000)
Total liabilities							(17,975,000)
Total preliminary purchase price allocation							$ 213,968,000