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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) $ (560,336) $ 221,962 $ (206,862)
State and local income taxes, net of federal income taxes (158,349) 74,105 (17,001)
Nontaxable equity contribution (20,353) 7,960 0
Executive compensation (2,437) (7,114) 0
Change in state tax rate due to acquisition 0 (117,496) 0
Change in state tax rate 10,078 37,073 0
Change in tax rate due to Tax Act 0 0 347,979
Deductible stock compensation 3,394 (131) 14,116
Goodwill impairment 0 (28,513) 0
Change in valuation allowance affecting tax expense (40) (189) (384)
Other, net (1,980) (4,350) (4,326)
Income tax benefit (expense) $ (730,023) $ 183,307 $ 133,522