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Subsequent Events - Narrative (Details) $ in Thousands		12 Months Ended
	Mar. 07, 2018 USD ($) ft² Properties	Dec. 31, 2017 USD ($) ft² Properties	Dec. 31, 2016 ft² Properties	Dec. 31, 2015 Properties
Subsequent Event [Line Items]
Area of real estate property		501,276	322,326
Subsequent Event [Member]
Subsequent Event [Line Items]
Gain on sale of investment real estate | $	$ 18,945
Retail Site [Member]
Subsequent Event [Line Items]
Number of properties sold | Properties			28	11
Area of real estate property		12,444,703	12,155,909
Retail Site [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Gross Disposition Price | $	$ 96,500
Retail Site [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Subsequent Event [Line Items]
Gross Disposition Price | $		$ 186,380
Number of properties sold | Properties		7
Area of real estate property		1,558,000
Retail Site [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of properties sold | Properties	2
Area of real estate property	725,000
IAGM Retail Fund I, LLC [Member] | Retail Site [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Gross Disposition Price | $	$ 38,000
Number of properties sold | Properties	1
Area of real estate property	265,000

X

- Definition

Discontinued operation, gross disposition price

+ References

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- Definition

Number Of Disposed Properties

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- Definition

Area of a real estate property.

+ References

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X

- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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