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)	$ (862,080)	$ (339,286)	$ (1,099,568)	$ (318,466)
Effective income tax rate, percent			29.91%	22.96%
Federal Statutory income tax rate, percent			21.00%		35.00%
CARES Act NOL Carryback			$ 305,000