Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Other Assets
Restricted investments	$ 1,180	$ 2,364
Accounts receivable, net	9,213	6,957
Homesite sales receivable	5,051	5,211	$ 3,760	$ 2,977
Notes receivable, net	6,848	3,252
Income tax receivable	2,302	2,843
Prepaid expenses	7,581	6,592
Straight line rent	3,351	3,292
Operating lease, right-of use assets	610	691
Other assets	8,732	5,715
Retained interest investments	12,668	12,214
Accrued interest receivable for Senior Notes held by SPE	935	2,938
Total other assets	$ 58,471	$ 52,069