THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net income (loss) per share and Segment reporting (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) segment $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income (loss) | $	$ 205,095	$ 134,258	$ (19,425)
Basic and diluted shares:
Weighted average ordinary shares outstanding (in shares)	54,946	52,863	50,310
Effect of dilutive shares (in shares)	1,716	1,783	0
Shares used to compute diluted net income (loss) per share (in shares)	56,662	54,646	50,310
Net income (loss) per share - basic (in USD per share) | $ / shares	$ 3.73	$ 2.54	$ (0.39)
Net income (loss) per share - diluted (in USD per share) | $ / shares	$ 3.62	$ 2.46	$ (0.39)
Antidilutive securities excluded from computation of earnings per share (in shares)	100	200	4,500
Segment reporting
Number of reportable segments | segment	1