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Notes Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Proceeds from notes receivable | $ 15,250 | $ 26,000 | $ 32,000
Note receivable exchanged for sale of real estate | 13,530 |  |
Additional advance | 326,268 | 187,173 | $ 156,344
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 |
Additional advance | 4,300 |  |
Mortgage loans on real estate interest until maturity | 400 |  |
Note receivable including accrued interest | 20,800 |  |
Core Portfolio | Note Receivable Due April 1, 2020 |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Proceeds from notes receivable |  | 15,000 |
Additional advance |  | 2,800 |
Core Portfolio | Town Center |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest |  | 300 |
Note receivable exchanged |  | 22,000 |
Pacesetter Park |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable exchanged for sale of real estate | $ 13,500 |  |
Effective interest rate | 5.10% |  |
Fund IV |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Proceeds from notes receivable | $ 15,300 |  |
Note receivable accrued interest | 10,000 |  |
Fund II |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest | 400 | 800 |
Fund III |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest | $ 4,700 | 4,700 |
Additional advance |  | $ 200 |

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