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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) $ in Thousands			3 Months Ended		12 Months Ended
	Jul. 01, 2013 USD ($)	Apr. 17, 2013 USD ($) ft² Properties	Mar. 31, 2018 USD ($) ft²	Mar. 31, 2017 USD ($) ft²	Dec. 31, 2017 USD ($) ft²	Sep. 30, 2017 USD ($)
Variable Interest Entity [Line Items]
Fair value of parking garage				$ 256,583
Land				75,194
Building and other improvements				$ 181,389
Square Feet | ft²			3,000,000	300,000	3,200,000
Carrying value of investment			$ 188,714		$ 180,764
Gross disposition price			127,500	$ 29,050
Provision for asset impairment			797	16,440
Proceeds from sale and transfer of investment properties, net			119,825	$ 28,474
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Carrying value of investment			131,603		123,693
The Plaza Midtown, Atlanta, GA
Variable Interest Entity [Line Items]
Fair value of parking garage						$ 10,790
Land			1,963		1,963
Building and other improvements			$ 8,827		$ 8,827
Retail
Variable Interest Entity [Line Items]
Square Feet | ft²			11,200,000	12,700,000	12,400,000
Bryant Square
Variable Interest Entity [Line Items]
Provision for asset impairment			$ 370
Proceeds from sale and transfer of investment properties, net			$ 2,148
Bryant Square | Retail
Variable Interest Entity [Line Items]
Square Feet | ft²			268,000
Gross disposition price			$ 38,000
Provision for asset impairment			672
Proceeds from sale and transfer of investment properties, net			$ 3,905
Unconsolidated Entities | IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Number of retail properties contributed | Properties		13
Square Feet | ft²		2,109,324
Carrying value of investment	$ 10,298	$ 96,788
Gross disposition price	$ 34,350	409,280
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
Accumulated amortization					$ 2,869

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