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Investments in Unconsolidated Joint Ventures - Narrative (Details) - USD ($) $ in Thousands | Feb. 16, 2018 | Dec. 14, 2017 | Sep. 18, 2017 | Mar. 17, 2017
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Westcor/Queen Creek LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain (Loss) On Land Sales |  | $ 5,436 |  |
Joint Venture | Westcor/Queen Creek LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Land sold |  | 30,491 |  |
Gain (Loss) On Land Sales |  | $ 14,853 |  |
Office building | Country Club Plaza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on sale of building |  |  |  | $ 2,290
Office building | Country Club Plaza | Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from sale of building |  |  |  | 78,000
Gain on sale of building |  |  |  | $ 4,580
Office building | Fashion District Philadelphia |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on sale of building | $ 2,773 |  | $ 6,539 |
Office building | Fashion District Philadelphia | Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from sale of building | 41,800 |  | 61,500 |
Gain on sale of building | $ 5,545 |  | $ 13,078 |

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