CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Rental and other property revenues	$ 33,505	$ 31,491	$ 96,194	$ 94,328
Property operating expenses	15,867	15,157	45,814	46,256
General and administrative	1,858	1,594	6,223	4,669
Interest income	4,021	3,175	11,441	10,305
Mortgage and loan interest	15,555	14,245	43,823	45,218
Related Parties [Member]
Rental and other property revenues	207	199	623	589
Property operating expenses	231	236	689	696
General and administrative	1,119	1,018	3,309	2,134
Interest income	3,303	3,041	9,380	10,670
Mortgage and loan interest	$ 364	$ 347	$ 1,009	$ 784