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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Parenthetical) (Details) | Dec. 31, 2020 | Dec. 31, 2018 | Nov. 16, 2017
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Broughton St. Portfolio Savannah, GA |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 100.00% |  |
Core Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 75.22% | 61.11% | 22.22%
Core Portfolio | Town Center |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 100.00% |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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