SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Reconciliation of Loans on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 114,943	$ 111,775	$ 160,991
Additions	59,585	18,418	3,805
Repayments		(15,250)	(31,000)
Conversion to real estate through receipt of deed	(72,428)		(22,021)
Allowance for credit loss	(650)
Balance at end of year	$ 101,450	$ 114,943	$ 111,775