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Loans Receivable - Loans Receivable Secured by Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loans receivable
Number of Loans (in loans) | loan	9
Face Amount of Mortgages	$ 161,530
Carrying Amount	157,572	$ 161,964	$ 42,037	$ 188,418
Interest income	16,553	9,844	10,406
Secured Mortgage Loans
Loans receivable
Interest income	$ 13,000	$ 6,000	$ 5,000
Mortgage loan on real estate, Texas due 2021
Loans receivable
Number of Loans (in loans) | loan	1
Face Amount of Mortgages	$ 2,250
Carrying Amount	$ 2,250
Interest Rate	7.50%
Mortgage Loans On Real Estate Interest Senior Housing Facility Only Florida Due 2021
Loans receivable
Number of Loans (in loans) | loan	1
Face Amount of Mortgages	$ 8,289
Carrying Amount	$ 8,289
Interest Rate	7.50%
Mortgage loan on real estate, Florida and California due 2021
Loans receivable
Number of Loans (in loans) | loan	4
Face Amount of Mortgages	$ 61,018
Carrying Amount	$ 57,861
Interest Rate	3.50%
Mortgage loan on real estate, California due 2022
Loans receivable
Number of Loans (in loans) | loan	1
Face Amount of Mortgages	$ 25,000
Carrying Amount	$ 24,462
Interest Rate	5.50%
Number of properties acquired | property	11
Mortgage loan on real estate, Florida due 2026
Loans receivable
Number of Loans (in loans) | loan	1
Face Amount of Mortgages	$ 51,716
Carrying Amount	$ 51,233
Interest Rate	2.00%
Mortgage loan on real estate, Florida due 2026 | LIBOR
Loans receivable
Interest Rate	4.25%
Mortgage loan on real estate, California due 2026
Loans receivable
Number of Loans (in loans) | loan	1
Face Amount of Mortgages	$ 13,257
Carrying Amount	$ 13,477
Interest Rate	2.00%
Mortgage loan on real estate, California due 2026 | LIBOR
Loans receivable
Interest Rate	4.25%

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Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
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Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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