THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Basic and diluted earnings per share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income (loss)	$ 4,654	$ 19,248	$ (2,514)	$ 29,744
Basic and diluted shares:
Weighted average ordinary shares (in shares)	47,900,000	46,191,000	47,629,000	45,943,000
Dilutive effect of employee share options and restricted stock units (RSUs) (in shares)	1,294,000	1,377,000	0	1,398,000
Shares used to compute diluted net income (loss) per share (in shares)	49,194,000	47,568,000	47,629,000	47,341,000
Net income (loss) per share - basic (in USD per share)	$ 0.10	$ 0.42	$ (0.05)	$ 0.65
Net income (loss) per share - diluted (in USD per share)	$ 0.09	$ 0.40	$ (0.05)	$ 0.63
Employee stock option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	502,921	508,326	1,328,654	1,372,376