Income Taxes (Statutory Tax Rate Impact on Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed expected tax benefit (expense)	$ (623,138)	$ 231,579	$ (206,862)
State and local income taxes, net of federal income taxes	(169,732)	74,426	(17,001)
Executive compensation	(2,437)	(7,114)	0
Change in state tax rate due to acquisition	0	(117,496)	0
Change in state tax rate	10,029	37,108	0
Change in tax rate due to Tax Act	0	0	347,979
Deductible stock compensation	3,394	(131)	14,116
Goodwill impairment	0	(30,960)	0
Change in valuation allowance affecting tax expense	(40)	(189)	(384)
Other, net	310	(2,348)	(4,326)
Income tax benefit (expense)	$ (781,614)	$ 184,875	$ 133,522