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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) ft² in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 24, 2019 USD ($)	Apr. 17, 2013 USD ($)	Jun. 30, 2019 USD ($) ft² VIE	Jun. 30, 2018 USD ($) ft²	Jun. 30, 2019 USD ($) ft² VIE	Jun. 30, 2018 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Jan. 01, 2018 USD ($)	Dec. 31, 2013 property
Variable Interest Entity [Line Items]
Number of variable interest entities | VIE			0		0
Proceeds from sale and transfer of investment properties, net					$ 31,842,000	$ 186,778,000
Provision for asset impairment			$ 1,443,000	$ 1,596,000	1,443,000	2,268,000
Proceeds from liquidation of unconsolidated entity					30,000,000	0
Retail | Rockwell Plaza
Variable Interest Entity [Line Items]
Provision for asset impairment			794,000
Loss on sale			307,000
Retail | Bryant Square
Variable Interest Entity [Line Items]
Provision for asset impairment			878,000	878,000	$ 1,248,000	1,248,000
Loss on sale						2,148,000
IAGM Retail Fund I, LLC | Retail
Variable Interest Entity [Line Items]
Provision for asset impairment				$ 1,596,000
IAGM Retail Fund I, LLC | Retail | Rockwell Plaza
Variable Interest Entity [Line Items]
Proceeds from sale and transfer of investment properties, net			$ 20,500,000
Area of real estate | ft²			255		255
Provision for asset impairment			$ 1,443,000
Loss on sale			559,000
IAGM Retail Fund I, LLC | Retail | Bryant Square
Variable Interest Entity [Line Items]
Proceeds from sale and transfer of investment properties, net						$ 38,000,000
Area of real estate | ft²				268		268
Provision for asset impairment						$ 672,000
Loss on sale						$ 3,905,000
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		$ 15,625,000
Equity investment basis adjustment, amortization period								30 years
Deferred gain on sale of property									$ 12,756,000
Unconsolidated Entities | Downtown Railyard Venture, LLC
Variable Interest Entity [Line Items]
Proceeds from liquidation of unconsolidated entity	$ 30,000,000
Other-than-temporary-impairment on unconsolidated entity							$ 29,933,000
Gain (loss) on transaction							$ 0
Mortgages
Variable Interest Entity [Line Items]
Extinguishment mortgage payable			16,250,000
Extended Maturity | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Extension period					1 year
Non Recourse, Mortgage Loan | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Carrying value of loans payable			14,872,000		$ 14,872,000
Loans Payable | Non Recourse, Mortgage Loan | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Debt instrument, face amount			$ 15,103,000		$ 15,103,000

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