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Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Purchase Price | $ 140,512 | $ 186,463
Core Portfolio |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 49,569 | $ 1,337
Core Portfolio | Soho Portfolio | 41, 51 and 53 Greene Street - New York, NY |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 49,569 |
Core Portfolio | Bedford Green Land Parcel | Bedford Hills N Y |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 1,337
Fund V |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 90,943 | $ 149,022
Fund V | Palm Coast Landing | Palm Coast, FL |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 36,644 |
Fund V | Trussville Promenade - Trussville, AL | Trussville, AL |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 45,259
Fund V | Lincoln Commons | Lincoln, RI |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 54,299 |
Fund V | Elk Grove Commons - Elk Grove, CA | Elk Grove, CA |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 59,320
Fund V | Hiram Pavilion | Hiram G A |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 44,443
Fund IV |  |
Business Acquisition [Line Items] |  |
Purchase Price |  | $ 36,104
Fund IV | Broughton Street Partners I | Savannah G A |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 36,104

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