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Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |
Purchase Price | $ 172,152 | $ 324,339
Core Portfolio |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 158,143 | $ 146,435
Core Portfolio | 917 W. Armitage - Chicago, IL |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 3,515 |
Core Portfolio | 849, 907 and 912 W. Armitage - Chicago, IL |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 10,738
Core Portfolio | 8436-8452 Melrose Place - Los Angeles, CA |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 48,691
Core Portfolio | Soho Acquisitions | 37 Greene Street - New York, NY |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 15,689 |
Core Portfolio | Soho Acquisitions | 41,45, 47, 51 and 53 Greene Street - New York, NY |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 87,006
Core Portfolio | Town Center | Wilmington, DE |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 138,939 |
Fund IV |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 14,009 |
Fund IV | 230-240 W. Broughton Street | GEORGIA |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 13,219 |
Fund IV | 102 E. Broughton Street | GEORGIA |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 790 |
Fund V |  |
Business Acquisition [Line Items] |  |
Purchase Price |  | $ 177,904
Fund V | Palm Coast Landing | Palm Coast, FL |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 36,644
Fund V | Lincoln Commons | Lincoln, RI |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 54,299
Fund V | Landstown Commons | Virginia Beach, VA |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 86,961

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