Real Estate Loans, Notes Receivable, and Lines of Credit Interest income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
interest revenue current pay	$ 23,248	$ 29,557	$ 34,906
Accrued exit fee revenue	9,769	12,372	13,829
Deferred Revenue, Revenue Recognized	1,819	1,214	1,545
amortization of purchase option termination fee income	9,712	6,536	9,111
Debt Instrument, Debt Default Interest, Amount	913	1,126	1,315
Net loan fee revenue	45,461	50,805	60,706
Interest Income, Money Market Deposits	2	40	687
Interest Income, Securities, Mortgage Backed	0	0	95
Interest income on loans and notes receivable	$ 45,463	$ 50,845	$ 61,488