CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 375,446	$ (38,453)	$ (62,813)
Net foreign currency translation adjustments	1,879	(4,496)	1,900
Net unrealized gain on revaluation of intercompany loans	75	303	385
Net unrealized gain (loss) on marketable debt securities	5,728	(542)	(1,614)
Total comprehensive income (loss)	$ 383,128	$ (43,188)	$ (62,142)