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Investments in Partially Owned Entities - Summary of Companys Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Variable Interest Entity [Line Items] |  |
Investments in Unconsolidated Entities | $ 58,124 | $ 58,254
Operating Property [Member] | Unconsolidated Non-VIE [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments in Unconsolidated Entities | $ 11,378 | 12,367
Ownership Percentage | 20.00% |
Other [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments in Unconsolidated Entities | $ 3,290 | 1,436
Consolidated VIE [Member] | Wisconsin Place Developer [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments in Unconsolidated Entities | $ 43,456 | $ 44,451
Ownership Percentage | 33.30% |

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