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Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |
Purchase Price | $ 95,750 | $ 172,152
Fund V |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 95,750 |
Fund V | Canton Marketplace | GEORGIA |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 50,954 |
Fund V | Monroe Marketplace | PENNSYLVANIA |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 44,796 |
Core Portfolio |  |
Business Acquisition [Line Items] |  |
Purchase Price |  | 158,143
Core Portfolio | Soho Acquisitions | 37 Greene Street - New York, NY |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price |  | 15,689
Core Portfolio | 917 W. Armitage | 917 W. Armitage - Chicago, IL |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price |  | 3,515
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

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