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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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Total carrying amount of mortgage loans as of the balance sheet date.

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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

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