Schedule IV - Mortgage Loans on Real Estate Schedule IV - Mortgage Loans on Real Estate (Roll-Forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of mortgage loans on real estate
Balance at beginning of period	$ 230,927	$ 259,491	$ 294,120
Additions:
New mortgage loans	67,978	33,160	55,059
Amortization of loan discount and commitment fees	907	741	806
Total Additions	68,885	33,901	55,865
Deductions:
Loan commitment fees received	497	0	222
Mortgage notes receivable related to investments in real estate	23,071	0	63,220
Collection of principal, less recoveries of previous write-downs	111,668	62,465	27,052
Total Deductions	135,236	62,465	90,494
Balance at end of period	$ 164,576	$ 230,927	$ 259,491