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Disposed Properties - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from the sale and transfer of investment properties, net |  | $ 346,707 | $ 430,514 | $ 233,686
Gross Disposition Price |  | $ 357,800 | $ 466,175 | 244,066
Gain on sale of investment property |  |  |  | $ 10,115
Discontinued Operations, Disposed of by Sale | Worldgate Plaza |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gross Disposition Price | $ 53,500 |  |  |

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