THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 5) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Net income per share
Net income	$ 111,380	$ 9,977	$ 13,540
Basic and diluted shares
Weighted average ordinary shares outstanding used to compute basic net income per share	41,308,000	36,263,000	33,591,000
Dilutive effect of employee stock option plans (in shares)	2,593,000	2,299,000	1,892,000
Shares used to compute diluted net income per share	43,901,000	38,562,000	35,483,000
Net income per share - basic (in dollars per share)	$ 2.70	$ 0.28	$ 0.40
Net income per share - diluted (in dollars per share)	$ 2.54	$ 0.26	$ 0.38
Segment reporting
Number of reportable segments	1
Options
Net income per share
Outstanding shares excluded from the computation of diluted net income per share	300,000	500,000	400,000
Restricted stock units
Net income per share
Outstanding shares excluded from the computation of diluted net income per share	15,451	27,033