CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 407,807	$ (154,175)	$ 3,030
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2,908)	3,352	(1,528)
Change in unrealized gain (loss) on available for sale securities	0	56,359	(56,359)
Change in fair value of derivatives qualifying as cash flow hedges	(873)	114	597
Other comprehensive (loss) income before income tax (provision) benefit	(3,781)	59,825	(57,290)
Income tax benefit (provision) related to items in other comprehensive income (loss)	377	19	(297)
Total other comprehensive (loss) income	(3,404)	59,844	(57,587)
Comprehensive income (loss)	404,403	(94,331)	(54,557)
Less: Comprehensive loss (income) attributable to non-controlling interests	4,527	1,566	(146)
Comprehensive income (loss), net	$ 408,930	$ (92,765)	$ (54,703)