Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (117,796)	$ (6,341)	$ (174,314)	$ (57,806)
Effective Income Tax Rate, Percent			(206.21%)	(46.48%)
Federal Statutory Income Tax Rate, Percent			21.00%		35.00%
CARES Act NOL Carryback			$ 48,000