Notes and Interest Receivable due from Related Party (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Income, Related Party	$ 5,635	$ 2,097	$ 10,830	$ 3,620
Arlo [Member]
Interest Income, Related Party	919	919	1,829	1,821
Cade Boca Raton [Member]
Interest Income, Related Party	420	420	835	807
Domain at The One Forty [Member]
Interest Income, Related Party	758	758	1,508	992
Fagler Village [Member]
Interest Income, Related Party	2,400	0	4,395	0
Novel Perimeter [Member]
Interest Income, Related Party	771	0	1,533	0
Vickers Historic Roswell [Member]
Interest Income, Related Party	$ 367	$ 0	$ 730	$ 0