Notes and Other Receivables - Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 756
Provision for credit losses	(62)	$ (38)
Ending balance	701
Mezzanine and Bridge Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	756
Provision for credit losses	(55)
Ending balance	701
Mezzanine Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	671
Provision for credit losses	14
Ending balance	685
Bridge Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	85
Provision for credit losses	(69)
Ending balance	$ 16