Schedule IV: Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 390,291	$ 157,572	$ 161,964
New mortgage loans	0	310,338	98,469
Draws and additions to existing mortgage loans	5,525	9,370	19,182
Total additions	5,525	319,708	117,651
Principal repayments	(47,591)	(84,486)	(113,200)
Reserve for loan losses	(6,476)	(2,503)	(8,843)
Total deductions	(54,067)	(86,989)	(122,043)
Balance at end of year	$ 341,749	$ 390,291	$ 157,572