THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Net Income (Loss) (Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income	$ 44,179	$ 38,429	$ 48,620	$ 37,057	$ 16,526	$ 37,843	$ 131,228	$ 91,426
Basic and diluted shares:
Weighted average ordinary shares outstanding (in shares)	55,180			53,232			54,708	52,560
Effect of dilutive shares (in shares)	1,555			1,380			1,697	1,823
Shares used to compute diluted net income per share (in shares)	56,735			54,612			56,405	54,383
Net income per share - basic (in USD per share)	$ 0.80			$ 0.70			$ 2.40	$ 1.74
Net income per share - diluted (in USD per share)	$ 0.78			$ 0.68			$ 2.33	$ 1.68
Share options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)				200				500