Fee and Other Income - Summary of Fee and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fee income:
Total fee income	$ 6,209	$ 4,213	$ 12,539	$ 10,212
Other income	920	3,086	3,151	6,135
Total fee and other income	7,129	7,299	15,690	16,347
Property Management Fees [Member]
Fee income:
Total fee income	2,239	1,599	4,689	3,241
Asset Management Fees [Member]
Fee income:
Total fee income	3,571	2,290	7,092	4,608
Acquisition, Disposition and Leasing Fee [Member]
Fee income:
Total fee income				1,331
Other Fee Income [Member]
Fee income:
Total fee income	$ 399	$ 324	$ 758	$ 1,032