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Investments in Partnerships - Term Loan (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2019
Jan. 31, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]            
Term Loans, net       $ 547,643   $ 547,289
Distribution of financing proceeds from equity method investee       $ 0 $ 123,000  
Fashion District Philadelphia            
Schedule of Equity Method Investments [Line Items]            
Term Loans, net   $ 250,000        
Ownership percentage   50.00%        
Debt instrument, maturity month and year   2023-01        
Debt instrument, interest rate terms   LIBOR plus 2.00%        
Proceeds from (Repayments of) Long-term debt and capital securities     $ 250,000      
Distribution of financing proceeds from equity method investee         $ 123,000  
Fashion District Philadelphia | Subsequent Event            
Schedule of Equity Method Investments [Line Items]            
Term Loans, net $ 350,000          
Proceeds from (Repayments of) Long-term debt and capital securities 26,000          
Distribution of financing proceeds from equity method investee $ 12,500          
Fashion District Philadelphia | LIBOR            
Schedule of Equity Method Investments [Line Items]            
Debt, variable interest rate   2.00%