CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Rental and other property revenues	$ 119,663	$ 104,188	$ 79,412
Property operating expenses	62,950	54,002	42,124
General and administrative	7,119	6,893	10,282
Interest income	20,453	16,674	20,054
Mortgage and loan interest	59,362	52,477	40,826
Related Party [Member]
Rental and other property revenues	708	726	701
Property operating expenses	900	770	645
General and administrative	4,053	3,855	3,628
Interest income	18,864	15,859	19,029
Mortgage and loan interest	$ 5,300	$ 3,774	$ 3,660