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Basis of Presentation and Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 15, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 11, 2019
Apr. 18, 2019
Income Tax Contingency [Line Items]            
Minimum percentage of taxable income distributed as dividends   90.00%        
Percentage of taxable income distributed   100.00%        
Deferred tax assets related to net operating loss carryforward utilized   $ 57,226 $ 109,949      
Deferred tax liabilities   29,444 28,676      
Income tax expense   $ 103,439 $ 37,633 $ 42,375    
Effective income tax reconcilation, percent   3.00% 8.20% 13.30%    
Income tax expense relating to purchase price fair value adjustment     $ 16,771      
Net basis difference of assets and liabilities between tax basis and GAAP basis   $ 4,000,000        
Ordinary Income            
Income Tax Contingency [Line Items]            
Percentage of taxable income distributed   62.10% 91.70%      
Long Term Capital Gain            
Income Tax Contingency [Line Items]            
Percentage of taxable income distributed   37.90% 8.30%      
220 Central Park South            
Income Tax Contingency [Line Items]            
Deferred tax assets related to net operating loss carryforward utilized   $ 10,257        
Income tax expense   $ 101,828 $ 13,888      
Farley Office and Retail Building            
Income Tax Contingency [Line Items]            
Equity method additional ownership percentage     44.90%      
Fifth Avenue and Times Square JV            
Income Tax Contingency [Line Items]            
Equity method ownership percentage   51.50%        
Fifth Avenue and Times Square JV | Joint Venture | Investors            
Income Tax Contingency [Line Items]            
Equity method ownership percentage           48.50%
Fifth Avenue and Times Square JV | Vornado Realty Trust | Joint Venture            
Income Tax Contingency [Line Items]            
Equity method ownership percentage           51.50%
Fifth Avenue and Times Square JV | Vornado Realty Trust | Joint Venture | Investors            
Income Tax Contingency [Line Items]            
Equity method investment, effective ownership transferred percentage           45.40%
330 Madison Avenue | Joint Venture            
Income Tax Contingency [Line Items]            
Equity method ownership percentage         25.00%  
Subsequent Event            
Income Tax Contingency [Line Items]            
Dividends per common share (usd per share) $ 1.95          
Amount of dividend considered long-term capital gain (in usd per share) $ 1.74