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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) ft² in Thousands, $ in Thousands				3 Months Ended		12 Months Ended
	Jan. 17, 2019 USD ($)	Feb. 28, 2018 USD ($) ft²	Apr. 17, 2013 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Jan. 01, 2018 USD ($)	Dec. 31, 2013 property
Variable Interest Entity [Line Items]
Proceeds from sale and transfer of investment properties, net				$ 0	$ 119,825
Provision for asset impairment				$ 0	672
IAGM Retail Fund I, LLC | Retail | Bryant Square
Variable Interest Entity [Line Items]
Proceeds from sale and transfer of investment properties, net		$ 38,000
Square Feet | ft²		268
Provision for asset impairment		$ 672			370
Loss on sale		$ 3,905			$ 2,148
Unconsolidated Entities | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Number of retail properties contributed | property									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
Unconsolidated Entities | Downtown Railyard Venture, LLC
Variable Interest Entity [Line Items]
Loss on sale	$ (4,981)					$ (4,483)
Gross disposition price of land	$ 33,374

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Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Properties Contributed

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Area of a real estate property.

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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