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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands | Aug. 31, 2018 USD ($) ft² | Jul. 06, 2018 USD ($) ft² | Feb. 16, 2018 USD ($) | Sep. 06, 2018 ft² | Mar. 01, 2018
--- | --- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Outside partner interest of the operating partnership |  |  |  |  | 75.00%
Proceeds from sale | $ 142,500 |  |  |  |
Ownership percentage |  |  |  |  | 25.00%
Westside Pavilion |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Property area (in square feet) | ft² | 680 |  |  |  |
Westcor/Queen Creek LLC | Office building | Land |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of building |  |  | $ 2,773 |  |
The Market at Estrella Falls |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of building |  | $ 2,996 |  |  |
Joint Venture | Westside Pavilion |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 75.00%
Joint Venture | Los Angeles Premium Outlets |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 400 |
Ownership percentage |  |  |  | 50.00% |
Joint Venture | Los Angeles Premium Outlets, second stage |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 165 |
Joint Venture | Fashion District Philadelphia | Office building |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from sale of building |  |  | 41,800 |  |
Joint Venture | Westcor/Queen Creek LLC | Office building | Land |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of building |  |  | $ 5,545 |  |
Joint Venture | Westside Pavilion |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of building | $ 46,242 |  |  |  |
Proceeds received in disposition of property | $ 142,500 |  |  |  |
Outside partner interest of the operating partnership | 75.00% |  |  |  |
Proceeds from sale | $ 36,903 |  |  |  |
Assumption of mortgage notes payable | 105,597 |  |  |  |
Joint Venture | The Market at Estrella Falls |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of building |  | $ 12,598 |  |  |
Property area (in square feet) | ft² |  | 298 |  |  |
Proceeds from sale |  | $ 49,100 |  |  |
Repayments of debt |  | $ 24,118 |  |  |
Replacement collateral |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from sale | 37,294 |  |  |  |
Replacement collateral | Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Marketable Securities | $ 149,175 |  |  |  |

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