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Fair Value Measurements (Fair Value Measurements on a Nonrecurring Basis) (Details) - Nonrecurring - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment in Fifth Avenue and Times Square JV   $ 0
Real estate assets    
Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment in Fifth Avenue and Times Square JV $ 2,955,957,000 $ 0
Real estate assets | Level 1    
Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment in Fifth Avenue and Times Square JV 0  
Real estate assets | Level 2    
Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment in Fifth Avenue and Times Square JV 0  
Real estate assets | Level 3    
Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment in Fifth Avenue and Times Square JV $ 2,955,957,000