Fee and Other Income - Summary of Fee and Other Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fee income:
Total fee income	$ 28,070	$ 22,744	$ 18,629
Other income	7,152	11,502	11,904
Total fee and other income	35,222	34,246	30,533
Property Management Fees [Member]
Fee income:
Total fee income	9,242	6,852	6,163
Asset Management Fees [Member]
Fee income:
Total fee income	14,266	10,442	7,912
Acquisition, Disposition and Leasing Fee [Member]
Fee income:
Total fee income	2,629	3,435	3,160
Other Fee Income [Member]
Fee income:
Total fee income	$ 1,933	$ 2,015	$ 1,394