Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (98,606)	$ (95,128)	$ (1,105,366)	$ (282,444)
Derivative financial instruments:
Reclassification adjustment for loss (gain) included in net loss	21	(2)	18	(5)
Investments in marketable securities:
Unrealized holding gain				23
Reclassification adjustment for gain included in net loss		(8)		(55)
Total other comprehensive gain (loss)	21	(10)	18	(37)
Comprehensive loss	$ (98,585)	$ (95,138)	$ (1,105,348)	$ (282,481)