Investment in Consolidated and Unconsolidated Entities - Schedule of Joint Ventures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2013 property
Schedule of net equity investment and share of net income or loss
Investment in unconsolidated entities		$ 118,861	$ 156,132
Unconsolidated Entities
Schedule of net equity investment and share of net income or loss
Investment in unconsolidated entities		$ 118,861	156,132
Unconsolidated Entities | IAGM Retail Fund I, LLC
Schedule of net equity investment and share of net income or loss
Ownership %		55.00%
Investment in unconsolidated entities		$ 118,861	126,195
Number of contributed properties | property					14
Aggregate deferred gain				$ 12,756
Amortization period	30 years
Unconsolidated Entities | Downtown Railyard Venture, LLC
Schedule of net equity investment and share of net income or loss
Ownership %		0.00%
Investment in unconsolidated entities		$ 0	30,049
Unconsolidated Entities | Other unconsolidated entities
Schedule of net equity investment and share of net income or loss
Investment in unconsolidated entities		$ 0	$ (112)