Schedule IV: Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 341,749	$ 390,291	$ 157,572
New mortgage loans	0	0	310,338
Draws and additions to existing mortgage loans	11,602	5,525	9,370
Total additions	11,602	5,525	319,708
Principal repayments	(183,084)	(47,591)	(84,486)
Reserve for loan losses	5,450	(6,476)	(2,503)
Total deductions	(177,634)	(54,067)	(86,989)
Balance at end of year	$ 175,717	$ 341,749	$ 390,291