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Notes Receivable, Net - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
note_receivable
property
Mortgage Loans on Real Estate [Line Items]            
Proceeds from notes receivable       $ 12,000 $ 42,819  
Recovered mortgage amount including accrued interest and fees       16,800    
Additional advance       120,252 $ 70,437  
Notes receivable, net       250,194   $ 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       198,395   $ 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       8.70%    
Brandywine Market Square            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net $ 153,400          
Brandywine Market Square | Core Portfolio            
Mortgage Loans on Real Estate [Line Items]            
Note receivable exchanged 16,000          
Note receivable accrued interest $ 300     $ 300    
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       500    
Notes receivable, net       $ 4,956   $ 4,506
Effective interest rate       18.00%    
Fund II            
Mortgage Loans on Real Estate [Line Items]            
Note receivable accrued interest       $ 600    
Notes receivable, net       $ 31,593   31,007
Effective interest rate       2.50%    
Fund IV            
Mortgage Loans on Real Estate [Line Items]            
Notes receivable, net       $ 15,250   $ 24,250
Effective interest rate       15.30%    
Fund IV | Notes Receivable | Collateralized Note, 9.8% Interest Rate            
Mortgage Loans on Real Estate [Line Items]            
Number of receivables issued | note_receivable           3