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	$ 31,491	$ 29,776	$ 94,328	$ 89,200
Property operating expenses	15,157	15,413	46,256	45,295
General and administrative	1,594	1,541	4,669	4,754
Interest income	3,175	4,251	10,305	11,386
Mortgage and loan interest	14,245	13,568	45,218	38,826
Related Parties [Member]
Rental and other property revenues	199	174	589	521
Property operating expenses	236	221	696	644
General and administrative	1,018	753	2,134	1,501
Interest income	3,041	4,249	10,670	10,269
Mortgage and loan interest	$ 347	$ 212	$ 784	$ 437