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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 17, 2013 USD ($)	Sep. 30, 2018 USD ($) ft² Property	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2018 USD ($) ft² Property	Sep. 30, 2017 USD ($) ft² Property	Dec. 31, 2017 USD ($)	Dec. 31, 2013 Properties
Variable Interest Entity [Line Items]
Fair value of parking garage		$ 150,217	$ 566,194	$ 150,217	$ 566,194
Land		23,001	125,990	23,001	125,990
Building and other improvements		127,216	440,204	127,216	440,204
Proceeds from sale and transfer of investment properties, net				254,424	197,843
Provision for asset impairment		$ 1,405	$ 0	$ 3,673	$ 0
Number of properties impaired | Property		2		3	3
Carrying value of investment		$ 188,135		$ 188,135		$ 180,764
Gross disposition price				282,950	$ 206,130
Provision for asset impairment				3,510	$ 16,440
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Carrying value of investment		$ 128,286		$ 128,286		$ 123,693
Retail
Variable Interest Entity [Line Items]
Square Feet | ft²		2,232,000	1,250,000	2,232,000	1,250,000
Gross disposition price				$ 282,950	$ 152,630
Bryant Square | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Proceeds from sale and transfer of investment properties, net				2,148
Provision for asset impairment		$ 773		2,020
Bryant Square | Retail | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Proceeds from sale and transfer of investment properties, net				$ 3,905
Number of properties impaired | Property				1
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
Provision for asset impairment		$ 1,405		$ 3,673
Number of properties impaired | Property		1		3
PGA Plaza and Kennesaw Marketplace [Member]
Variable Interest Entity [Line Items]
Loan advanced to VIE		$ 152,300

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