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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

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