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Investment in Consolidated and Unconsolidated Entities - Unconsolidated Entities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Debt Maturities of the Unconsolidated Entities |  |
Mortgage debt | $ 311,657 | $ 311,574
IAGM Retail Fund I, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Mortgage Loans on Real Estate | 15,103 |
Schedule of Debt Maturities of the Unconsolidated Entities |  |
2018 | 188,925 |
2019 | 31,353 |
2020 | 0 |
2021 | 23,150 |
2022 | 0 |
Thereafter | 68,805 |
Mortgage debt | 312,233 |
Recourse debt | $ 23,000 |

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- Definition Total carrying amount of mortgage loans as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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