Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 478,035	$ 298,373	$ 222,766
Other comprehensive income (loss):
Foreign currency translation adjustments	(1,020)	(27,585)	36,151
Change in unrealized gain (loss) on investments, net of income tax (provision) benefit of $(666), $(200) and $245 for the years ended December 31, 2019, 2018 and 2017, respectively	4,788	603	(406)
Other comprehensive income (loss)	3,768	(26,982)	35,745
Comprehensive income	$ 481,803	$ 271,391	$ 258,511