Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (29,417)	$ (34,585)	$ (56,518)	$ (51,465)
Effective Income Tax Rate, Percent			(108.84%)	(60.03%)
Federal Statutory Income Tax Rate, Percent			21.00%		35.00%
CARES Act NOL Carryback			$ 30,000