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Notes Receivable, Net - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Proceeds from notes receivable $ 15,250 $ 26,000  
Additional advance 183,556 $ 122,332  
Core Portfolio      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Note receivable accrued interest     $ 200
Proceeds from notes receivable     26,000
Mortgage loans on real estate interest until maturity 400    
Core Portfolio | Note Receivable Due April 1, 2020      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Proceeds from notes receivable     15,000
Additional advance     2,800
Core Portfolio | Town Center      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Note receivable accrued interest     300
Note receivable exchanged     22,000
Fund II      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Note receivable accrued interest 400   800
Fund IV      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Note receivable accrued interest 10,000    
Proceeds from notes receivable 15,250    
Fund III      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Note receivable accrued interest $ 4,700   4,700
Additional advance     $ 200