CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Rental and other property revenues	$ 31,807	$ 30,067	$ 95,216	$ 90,106
Property operating expenses	15,403	15,671	47,098	46,078
General and administrative	1,766	1,760	5,797	6,197
Mortgage and loan interest	15,717	15,362	49,859	43,551
Related Party [Member]
Rental and other property revenues	199	174	289	521
Property operating expenses	245	230	721	671
General and administrative	1,074	941	2,534	1,860
Interest income	3,638	5,395	13,511	14,482
Mortgage and loan interest	$ 1,718	$ 1,412	$ 4,914	$ 3,860