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Schedule IV: Mortgage Loans on Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Monthly Debt Service	710
Face Amount of Mortgages	161,530
Carrying Amount	157,572	$ 161,964	$ 42,037	$ 188,418
Principal Amount Subject to Delinquent Principal or Interest	$ 0
California
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of properties with first mortgages | property	11
Texas, Florida And California
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of properties with first mortgages | property	1
Mortgage loan on real estate, Texas due 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.50%
Face Amount of Mortgages	$ 2,250
Carrying Amount	$ 2,250
Mortgage loan on real estate, Texas due 2021 | Other Non-reportable | Texas
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.50%
Prior Liens	$ 0
Monthly Debt Service	15
Face Amount of Mortgages	2,250
Carrying Amount	2,250
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage Loans On Real Estate Interest Only Florida Due 2021, Principal $8289 | Other Non-reportable | Florida
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.50%
Prior Liens	$ 0
Monthly Debt Service	54
Face Amount of Mortgages	8,289
Carrying Amount	8,289
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage loan on real estate, Florida due 2026
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
Face Amount of Mortgages	$ 51,716
Carrying Amount	$ 51,233
Mortgage loan on real estate, Florida due 2026 | Other Non-reportable | Florida
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
Prior Liens	$ 0
Monthly Debt Service	276
Face Amount of Mortgages	51,716
Carrying Amount	51,233
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage loan on real estate, Florida due 2026 | LIBOR
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.25%
Mortgage loan on real estate, Florida due 2026 | LIBOR | Other Non-reportable | Florida
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.0425%
Mortgage loan on real estate, California due 2026
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
Face Amount of Mortgages	$ 13,257
Carrying Amount	$ 13,477
Mortgage loan on real estate, California due 2026 | Other Non-reportable | California
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
Prior Liens	$ 0
Monthly Debt Service	70
Face Amount of Mortgages	13,257
Carrying Amount	13,477
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage loan on real estate, California due 2026 | LIBOR
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.25%
Mortgage loan on real estate, California due 2026 | LIBOR | Other Non-reportable | California
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.0425%
Mortgage loan on real estate, Florida and California due 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Face Amount of Mortgages	$ 61,018
Carrying Amount	$ 57,861
Mortgage loan on real estate, Florida and California due 2021 | Other Non-reportable | Florida
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Prior Liens	$ 0
Monthly Debt Service	23
Face Amount of Mortgages	7,798
Carrying Amount	6,397
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage Loans On Real Estate Interest Only Florida Due 2021, Principal $3912 | Other Non-reportable | Florida
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Prior Liens	$ 0
Monthly Debt Service	11
Face Amount of Mortgages	3,912
Carrying Amount	3,137
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage Loans On Real Estate Interest Only Florida Due 2021, Principal $14208 | Other Non-reportable | Florida
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Prior Liens	$ 0
Monthly Debt Service	41
Face Amount of Mortgages	14,208
Carrying Amount	13,968
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage loan on real estate, California due 2021 | Other Non-reportable | California
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Prior Liens	$ 0
Monthly Debt Service	102
Face Amount of Mortgages	35,100
Carrying Amount	34,359
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Mortgage loan on real estate, California due 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.50%
Face Amount of Mortgages	$ 25,000
Carrying Amount	$ 24,462
Mortgage loan on real estate, California due 2022 | Other Non-reportable | California
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.50%
Prior Liens	$ 0
Monthly Debt Service	118
Face Amount of Mortgages	25,000
Carrying Amount	24,462
Principal Amount Subject to Delinquent Principal or Interest	$ 0

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