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v3.19.1

Investment in Consolidated and Unconsolidated Entities - Narrative (Details) ft² in Thousands, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 17, 2019 USD ($) | Feb. 28, 2018 USD ($) ft² | Apr. 17, 2013 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Jan. 01, 2018 USD ($) | Dec. 31, 2013 property
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  |  | $ 0 | $ 119,825 |  |  |  |
Provision for asset impairment |  |  |  | $ 0 | 672 |  |  |  |
IAGM Retail Fund I, LLC | Retail | Bryant Square |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  | $ 38,000 |  |  |  |  |  |  |
Square Feet | ft² |  | 268 |  |  |  |  |  |  |
Provision for asset impairment |  | $ 672 |  |  | 370 |  |  |  |
Loss on sale |  | $ 3,905 |  |  | $ 2,148 |  |  |  |
Unconsolidated Entities | IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of retail properties contributed | property |  |  |  |  |  |  |  |  | 14
Proceeds from sale and transfer of investment properties, net |  |  | $ 15,625 |  |  |  |  |  |
Equity investment basis adjustment, amortization period |  |  |  |  |  |  | 30 years |  |
Deferred gain on sale of property |  |  |  |  |  |  |  | $ 12,756 |
Unconsolidated Entities | Downtown Railyard Venture, LLC |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Loss on sale | $ (4,981) |  |  |  |  | $ (4,483) |  |  |
Gross disposition price of land | $ 33,374 |  |  |  |  |  |  |  |

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