Income Taxes (Component of (Loss) Income Before Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (44,010)	$ (316,479)	$ (140,298)
Foreign	(3,006)	(23,524)	(15,264)
Total	$ (47,016)	$ (340,003)	$ (155,562)