OTHER INCOME (LOSS), NET: (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Apr. 27, 2015 item	Mar. 31, 2015 item	Mar. 31, 2014	Dec. 31, 2014 item
Other income, net
Interest income and gain on sale of investments, net		$ 663	$ 333
Impairment loss on equity investment in a private company		(3,189)
Foreign exchange gain (loss)		57	(99)
Total other income, net		$ (2,469)	$ 234
Number of privately-held companies impaired	1
Number of Privately Held Companies in which Entity Held Investments		3		3