Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (144,820)	$ (113,988)	$ (1,006,760)	$ (187,316)
Derivative financial instruments:
Reclassification adjustment for gain included in net loss	(2)	(2)	(3)	(3)
Investments in marketable securities:
Unrealized holding gain		9		23
Reclassification adjustment for gain included in net loss		(15)		(47)
Total other comprehensive loss	(2)	(8)	(3)	(27)
Comprehensive loss	$ (144,822)	$ (113,996)	$ (1,006,763)	$ (187,343)