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Notes Receivable, Net - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
property
note_receivable
Dec. 31, 2015
USD ($)
Mortgage Loans on Real Estate [Line Items]            
Proceeds from notes receivable       $ 32,000 $ 42,819 $ 15,984
Recovered mortgage amount including accrued interest and fees       16,800    
Additional advance       156,344 222,071 $ 90,234
Notes receivable, net       153,829 276,163  
Recovered interest income   $ 1,400 $ 2,200      
Nonperforming Financial Instruments            
Mortgage Loans on Real Estate [Line Items]            
Proceeds from notes receivable       12,000    
Notes receivable, net         12,000  
Notes Receivable | Collateralized Note, 9.8% Interest Rate            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net         $ 47,500  
Effective interest rate         9.80%  
Number of properties collateralized | property         4  
Notes Receivable | Five Notes Issued in Periods Prior to 2016            
Mortgage Loans on Real Estate [Line Items]            
Proceeds from notes receivable         $ 42,800  
Notes receivable, net         $ 29,600  
Number of notes repaid | note_receivable         5  
Notes Receivable | First Mortgage Loan, 8.1% Loan, Due 2019            
Mortgage Loans on Real Estate [Line Items]            
Effective interest rate         8.10%  
Mezzanine Loan | Mezzanine Loan, 15% Loan            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net         $ 30,900  
Effective interest rate         15.00%  
Core Portfolio            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net       101,695 $ 216,400  
Core Portfolio | Notes Receivable of $10 million            
Mortgage Loans on Real Estate [Line Items]            
Additional advance       10,000    
Notes receivable, net         $ 20,000  
Core Portfolio | Note Receivable, Due June 1, 2018            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net       $ 15,000    
Core Portfolio | Notes Receivable | Collateralized Note, 9.8% Interest Rate            
Mortgage Loans on Real Estate [Line Items]            
Number of receivables issued | note_receivable         1  
Maximum | Core Portfolio            
Mortgage Loans on Real Estate [Line Items]            
Effective interest rate       8.10%    
Market Square            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net $ 153,400          
Market Square | Core Portfolio            
Mortgage Loans on Real Estate [Line Items]            
Note receivable exchanged $ 92,700          
Note receivable accrued interest       $ 1,800    
Shopping Center in Windham, ME            
Mortgage Loans on Real Estate [Line Items]            
Note receivable exchanged       9,000    
Note receivable accrued interest       100    
Fund III            
Mortgage Loans on Real Estate [Line Items]            
Additional advance       600    
Fund II            
Mortgage Loans on Real Estate [Line Items]            
Note receivable accrued interest       $ 800    
Fund IV | Notes Receivable | Collateralized Note, 9.8% Interest Rate            
Mortgage Loans on Real Estate [Line Items]            
Number of receivables issued | note_receivable         3