THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 5) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Net income per share
Net income (loss)	$ (23,342)	$ 111,951	$ 10,334
Basic and diluted shares:
Weighted average ordinary shares outstanding used to compute basic net income (loss) per share	43,421,000	41,308,000	36,263,000
Dilutive effect of employee share option and purchase plan (in shares)		2,593,000	2,299,000
Shares used to compute diluted net income (loss) per share	43,421,000	43,901,000	38,562,000
Net income (loss) per share - basic (in dollars per share)	$ (0.54)	$ 2.71	$ 0.29
Net income (loss) per share - diluted (in dollars per share)	$ (0.54)	$ 2.55	$ 0.27
Segment reporting
Number of reportable segments	1
Share options
Net income per share
Outstanding shares excluded from the computation of diluted net income per ordinary share	800,000	300,000	500,000