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Real Estate Investments Business Acquisitions (Parenthetical) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Contributions from partners | $ 2,151 | $ 13,000 | $ 13,478
Pablo Plaza [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase of building for redevelopment | ft² |  | 5,000 |
Carytown Exchange [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contributions from partners |  | $ 13,000 |

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