Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (314,925)	$ (153,040)	$ (305,250)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation and other comprehensive income (loss)	(1,939)	(14,727)	22,724
Investments:
Change in unrealized gain (loss), net of tax	0	0	3,790
Reclassification adjustments due to adoption of ASU 2016-01	0	(4,876)	0
Reclassification adjustments for losses included in net loss, net of tax	0	0	(33)
Comprehensive loss	$ (316,864)	$ (172,643)	$ (278,769)