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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

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