THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 4) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income per share
Net income (loss)	$ 19,248	$ (8,867)	$ 29,744	$ (19,847)
Basic and diluted shares:
Weighted average ordinary shares outstanding used to compute basic net income (loss) per share	46,191,000	44,671,000	45,943,000	44,475,000
Dilutive effect of employee share option and purchase plan (in shares)	1,377,000		1,398,000
Shares used to compute diluted net income (loss) per share	47,568,000	44,671,000	47,341,000	44,475,000
Net income (loss) per share - basic (in dollars per share)	$ 0.42	$ (0.20)	$ 0.65	$ (0.45)
Net income (loss) per share - diluted (in dollars per share)	$ 0.40	$ (0.20)	$ 0.63	$ (0.45)
Net income per share
Outstanding shares excluded from the computation of diluted net income (loss) per ordinary share		1,372,376		839,133
Share options
Net income per share
Outstanding shares excluded from the computation of diluted net income (loss) per ordinary share	508,326		517,409