Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Assets
Restricted investments	$ 1,171	$ 2,364
Accounts receivable, net	10,791	6,957
Homesite sales receivable	5,675	5,211	$ 2,977
Notes receivable, net	10,877	3,252
Income tax receivable		2,843
Inventory	2,026	1,384
Prepaid expenses	7,135	6,592
Straight-line rent	3,174	3,292
Operating lease, right-of use assets	808	691
Other assets	5,743	4,331
Retained interest investments	12,905	12,214
Accrued interest receivable for Senior Notes held by SPE	2,938	2,938
Total other assets	$ 63,243	$ 52,069