THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Basic and diluted earnings per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income (loss)	$ 3,403	$ 12,037	$ (16,832)	$ 9,523
Basic and diluted shares:
Weighted average ordinary shares (in shares)	50,587	48,385	49,999	47,883
Dilutive effect of employee share options and restricted stock units (RSUs) (in shares)	988	1,109	0	1,349
Shares used to compute diluted net income (loss) per share (in shares)	51,575	49,494	49,999	49,232
Net income (loss) per share - basic (in USD per share)	$ 0.07	$ 0.25	$ (0.34)	$ 0.20
Net income (loss) per share - diluted (in USD per share)	$ 0.07	$ 0.24	$ (0.34)	$ 0.19
Share options and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	1,800	600	5,100	700