SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage loans on real estate
Balance at the beginning of the period	$ 257,251	$ 254,099	$ 242,939
New mortgage loans	88,415		7,500
Other additions	540	4,253	4,842
Application of interest reserve	298
Amortization of mortgage premium	(6)	(4)	(4)
Collections of principal	(1,175)	(1,065)	(1,065)
Loan loss reserve	(881)	(32)	(113)
Balance at the end of the period	$ 344,442	$ 257,251	$ 254,099