Investment in Unconsolidated Entities - Schedule Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Liabilities and equity:
Mortgages payable, net	$ 243,955
Carrying value of investments in unconsolidated entities	117,220		$ 118,861
Operating expenses
Net income (loss)	3,255	$ (4,100)
Company's share of net income (loss)	1,744	(3,944)
Equity in earnings of unconsolidated entities	789	459
IAGM Retail Fund I, LLC
Assets
Real estate assets, net of accumulated depreciation	405,633		425,585
Other assets	64,041		66,437
Total assets	469,674		492,022
Liabilities and equity:
Mortgages payable, net	241,980		256,732
Other liabilities	14,385		20,765
Equity	213,309		214,525
Total liabilities and equity	469,674		492,022
Company's share of equity	118,175		118,861
Deferred gain, net of accumulated amortization of $3	(955)		0
Carrying value of investments in unconsolidated entities	117,220		$ 118,861
Accumulated amortization	3
Statements of Operations:
Total income	12,723	13,640
Operating expenses
Depreciation and amortization	(4,342)	(5,276)
Property operating	(2,121)	(1,987)
Real estate taxes	(2,426)	(2,606)
Interest expense, net	(2,193)	(2,894)
General and administrative	(119)	(119)
Gain on sale of real estate	1,741	0
Loss on debt extinguishment	(8)	0
Net income (loss)	3,255	758
Outside basis adjustment for investee's sale of real estate	(955)	0
Downtown Railyard Venture, LLC
Operating expenses
Net income (loss)	0	(4,858)
Outside basis adjustment for investee's sale of real estate	$ 0	$ 4,403