CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Rental revenues	$ 51,909	$ 46,231	$ 113,944
Property operating expenses	24,360	25,213	59,420
General and administrative	9,287	8,704	11,359
Affiliate
Rental revenues	1,083
Property operating expenses	990	991	943
General and administrative	3,869	4,144	4,578
Interest income	19,515	17,413	13,132
Interest expense	$ 1,581	$ 1,999	$ 423