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Notes Receivable, Net - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Note receivable exchanged $ 22,021 $ 101,705    
Proceeds from notes receivable 26,000 32,000 $ 42,819  
Additional advance 187,173 156,344 222,071  
Recovered mortgage amount including accrued interest and fees   16,800    
Notes receivable, net 109,613 153,829 $ 276,163 $ 147,188
Nonperforming Financial Instruments        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Proceeds from notes receivable   12,000    
Fund III        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Additional advance 200 600    
Fund II        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Note receivable accrued interest 800 800    
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      
Notes receivable, net 56,475 101,695    
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 | Notes Receivable of $10 million        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Additional advance   10,000    
Notes receivable, net   20,000    
Core Portfolio | Note Receivable, Due June 1, 2018        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Notes receivable, net   15,000    
Town Center | Core Portfolio        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Note receivable exchanged 22,000      
Note receivable accrued interest $ 300      
Market Square and Town Center Properties | Core Portfolio        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Note receivable exchanged   92,700    
Note receivable accrued interest   1,800    
Shopping Center in Windham, ME        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Note receivable exchanged   9,000    
Note receivable accrued interest   $ 100