Unaudited Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (24,323)	$ (24,488)	$ (55,753)	$ (47,127)
Other comprehensive income:
Unrealized income (loss) on marketable securities, net of tax	(137)	31	47	50
Income (loss) on marketable securities reclassified into earnings, net of tax	15	3	27	(6)
Total	(122)	34	74	44
Unrealized income on derivative instruments, net of tax	535	832	1,137	3,316
Realized income on derivative instruments, net of tax	2,471	0	2,471	0
Loss on derivative instruments reclassified into earnings, net of tax	361	80	304	531
Total	3,367	912	3,912	3,847
Total other comprehensive income	3,245	946	3,986	3,891
Comprehensive loss	$ (21,078)	$ (23,542)	$ (51,767)	$ (43,236)