Fee and Other Income - Summary of Fee and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fee income:
Total fee income	$ 9,153	$ 7,159	$ 21,692	$ 17,371
Other income	2,202	2,979	5,353	9,114
Total fee and other income	11,355	10,138	27,045	26,485
Property Management Fees [Member]
Fee income:
Total fee income	2,270	1,692	6,959	4,933
Asset Management Fees [Member]
Fee income:
Total fee income	3,636	2,665	10,728	7,273
Acquisition, Disposition and Leasing Fee [Member]
Fee income:
Total fee income	2,586	2,104	2,586	3,435
Other Fee Income [Member]
Fee income:
Total fee income	$ 661	$ 698	$ 1,419	$ 1,730