Preferred Equity Investments and Investments in Unconsolidated Real Estate Joint Ventures (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance Sheets:
Real estate, net of depreciation	$ 577,624	$ 399,111
Other assets	45,324	62,667
Total assets	622,948	461,778
Mortgage payable	480,903	325,702
Other liabilities	21,250	25,956
Total liabilities	502,153	351,658
Members' equity	120,795	110,120
Total liabilities and members' equity	622,948	461,778
Operating Statement:
Rental revenues	19,222	5,517	$ 6,652
Operating expenses	(14,824)	(4,990)	(3,760)
Income before debt service, acquisition costs, and depreciation and amortization	4,398	527	2,892
Interest expense, net	(12,935)	(3,098)	(1,409)
Acquisition costs	0	0	(3)
Depreciation and amortization	(10,385)	(3,384)	(2,881)
Operating loss	(18,922)	(5,955)	(1,401)
Gain on sale	0	0	16,733
Net (loss) income	$ (18,922)	$ (5,955)	$ 15,332