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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) ft² | Jul. 06, 2018 USD ($) ft² | Feb. 16, 2018 USD ($) | Dec. 14, 2017 USD ($) | Sep. 18, 2017 USD ($) | Mar. 17, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 06, 2018 ft² | Mar. 01, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 142,500 |  |  |  |  |  |  |  |  |  |
Outside partner interest of the operating partnership |  |  |  |  |  |  |  |  |  |  | 75.00%
Proceeds received in disposition of property |  |  |  |  |  |  |  | $ 36,305 | $ 0 |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  | 25.00%
Country Club Plaza | Office building |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of building |  |  |  |  |  | $ 2,290 |  |  |  |  |
Fashion District Philadelphia | Office building |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of building |  |  | $ 2,773 |  | $ 6,713 |  |  |  |  |  |
Westcor/Queen Creek LLC | Land |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain sale of land |  |  |  | $ 5,436 |  |  |  |  |  |  |
The Market at Estrella Falls |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of building |  | $ 2,996 |  |  |  |  |  |  |  |  |
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 | Country Club Plaza | Office building |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  | 78,000 |  |  |  |  |
Gain on sale of building |  |  |  |  |  | $ 4,580 |  |  |  |  |
Joint Venture | Fashion District Philadelphia | Office building |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  | 41,800 |  | 61,500 |  |  |  |  |  |
Gain on sale of building |  |  | $ 5,545 |  | $ 13,426 |  |  |  |  |  |
Joint Venture | Westcor/Queen Creek LLC | Land |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | 30,491 |  |  |  |  |  |  |
Gain sale of land |  |  |  | $ 14,853 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Joint Venture | Westside Pavilion |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of building | $ 46,242 |  |  |  |  |  | $ 46,242 | $ 46,242 |  |  |
Property area (in square feet) | ft² | 755 |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 36,903 |  |  |  |  |  |  |  |  |  |
Outside partner interest of the operating partnership | 75.00% |  |  |  |  |  |  |  |  |  |
Proceeds received in disposition of property | $ 142,500 |  |  |  |  |  |  |  |  |  |
Assumption of mortgage notes payable | $ 105,597 |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 75.00% | 75.00% |  |  |

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