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Notes Receivable, Net - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Proceeds from notes receivable $ 26,000 $ 12,000  
Recovered mortgage amount including accrued interest and fees     $ 16,800
Additional advance 119,752 $ 98,528  
Notes receivable, net 109,209   153,829
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
Core Portfolio      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Proceeds from notes receivable 26,000    
Note receivable accrued interest 200    
Notes receivable, net 56,475   101,695
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
Core Portfolio | Note Receivable Due April 1, 2020      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Additional advance $ 2,800    
Maximum | Core Portfolio      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Effective interest rate 8.10%    
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    
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
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 $ 400   800
Market Square And Town Center Properties [Member] | 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