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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 17, 2013 USD ($) | Jun. 30, 2018 USD ($) ft² | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) ft² | Jun. 30, 2018 USD ($) ft² Property | Jun. 30, 2017 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2013 Properties
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Fair value of parking garage |  | $ 143,444 |  | $ 256,583 | $ 143,444 | $ 256,583 |  |
Land |  | 21,629 |  | 75,194 | 21,629 | 75,194 |  |
Building and other improvements |  | 121,815 |  | 181,389 | 121,815 | 181,389 |  |
Proceeds from sale and transfer of investment properties, net |  |  |  |  | 186,778 | 96,468 |  |
Provision for asset impairment |  | 1,596 |  | $ 0 | $ 2,268 |  |  |
Number of properties impaired | Property |  |  |  |  | 2 |  |  |
Carrying value of investment |  | 188,447 |  |  | $ 188,447 |  | $ 180,764 |
Gross disposition price |  |  |  |  | 212,950 | 99,330 |  |
Provision for asset impairment |  |  |  |  | 797 | $ 16,440 |  |
IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Carrying value of investment |  | 129,519 |  |  | 129,519 |  | 123,693 |
The Plaza Midtown, Atlanta, GA |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Land |  | 1,963 |  |  | 1,963 |  | 1,963 |
Building and other improvements |  | $ 8,827 |  |  | $ 8,827 |  | $ 8,827 |
Retail |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Square Feet | ft² |  | 1,759,000 |  | 761,000 | 1,759,000 | 761,000 |  |
Gross disposition price |  |  |  |  | $ 212,950 | $ 99,330 |  |
Bryant Square |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  | $ 2,148 |  |  |  |  |
Provision for asset impairment |  | $ 878 |  |  | 1,248 |  |  |
Bryant Square | Retail |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  |  |  | $ 3,905 |  |  |
Square Feet | ft² |  | 268,000 |  |  | 268,000 |  |  |
Gross disposition price |  |  |  |  | $ 38,000 |  |  |
Provision for asset impairment |  |  |  |  | $ 672 |  |  |
Unconsolidated Entities | IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of retail properties contributed | Properties |  |  |  |  |  |  |  | 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 |
PGA Plaza and Kennesaw Marketplace [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Loan advanced to VIE |  | $ 152,300 |  |  |  |  |  |

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