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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 |

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