Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Other Assets
Restricted investments		$ 1,171
Investments - equity securities	$ 375	2,623
Accounts receivable, net	13,984	10,791
Homesite sales receivable	5,969	5,675	$ 5,051	$ 5,211
Notes receivable, net	15,115	10,877
Income tax receivable	117
Inventory	2,639	2,026
Prepaid expenses	8,054	7,135
Straight-line rent	2,511	3,174
Operating lease, right-of use assets	$ 794	$ 808
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total other assets	Total other assets
Other assets	$ 5,860	$ 5,743
Retained interest investments	13,544	12,905
Accrued interest receivable for Senior Notes held by SPE	935	2,938
Total other assets	$ 69,897	$ 65,866