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Investments in Unconsolidated Joint Ventures - Narrative (Details) - USD ($) | Dec. 18, 2019 | Aug. 16, 2019 | Jul. 25, 2019 | Feb. 22, 2019 | Oct. 17, 2019 | Sep. 12, 2019 | Feb. 21, 2019
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The Shops at Atlas Park |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Amount of additional borrowing |  |  |  | $ 9,189,000 |  |  |
Joint Venture | The Shops at Atlas Park |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
New loan |  |  |  | 80,000,000 |  |  | $ 57,751,000
Amount of additional borrowing |  |  |  | $ 18,379,000 |  |  |
Joint Venture | Fashion District Philadelphia |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Amount of additional borrowing |  | $ 25,000,000 | $ 26,000,000 |  |  |  |
Additional borrowings |  |  | $ 100,000,000 |  |  |  |
Interest rate spread over basis |  |  | 2.00% |  |  |  |
Joint Venture | Tysons Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
New loan |  |  |  |  |  | $ 190,000,000 |
Effective interest rate |  |  |  |  |  | 3.38% |
Joint Venture | West Acres |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Additional borrowings |  |  |  |  | $ 6,500,000 |  |
Effective interest rate |  |  |  |  | 3.72% |  |
Joint Venture | One Westside | Construction loan |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Amount of additional borrowing | $ 414,600,000 |  |  |  |  |  |
Joint Venture | One Westside | Construction loan | LIBOR |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Interest rate spread over basis | 1.70% |  |  |  |  |  |
Variable interest rate spread, contingent (as a percent) | 1.50% |  |  |  |  |  |

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