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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]    
Tax (provision) benefit $ 1,104 $ 3,069
State and local income taxes, net of federal income tax 666 15,413
Equity in net income of affiliates (6,241) (73,997)
Provision for unrecognized tax benefits 46,534 (1,234)
Nondeductible expenses (957) (1,235)
Change in valuation allowance (4,329) (120,389)
Income tax credits 4,554 138,780
Foreign income taxes (250) (250)
Effect of U.S. tax law changes (1,542) (33,248)
Other, net (191) (17)
Income tax benefit (provision) $ 39,348 $ (73,108)
U.S. statutory rate 21.00% 35.00%