SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Principal Balance	312,343	$ 22,343	$ 21,468
Book Value	312,347
Aggregate cost for federal income tax purposes	314,300
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at the beginning of the year	22,343	21,468	23,146
Additions during period:
Draws	0	706	1,689
New mortgage loans	290,000	0	0
Interest income added to principal	0	169	194
Deductions during period:
Paydowns/repayments	0	0	(3,561)
Balance at the end of the year	312,343	$ 22,343	$ 21,468
Mortgages
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Principal Balance	309,000
Book Value	309,000
Deductions during period:
Balance at the end of the year	$ 309,000
Mortgages | River Vista
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	10.00%
Prior Liens	$ 0
Principal Balance	19,000
Book Value	19,000
Deductions during period:
Balance at the end of the year	$ 19,000
Mortgages | RCA
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	7.50%
Prior Liens	$ 0
Principal Balance	290,000
Book Value	290,000
Deductions during period:
Balance at the end of the year	$ 290,000
Construction Mortgages | Arlington
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	8.00%
Prior Liens	$ 0
Principal Balance	3,343
Book Value	3,347
Deductions during period:
Balance at the end of the year	$ 3,343