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Schedule IV - Mortgage Loans on Real Estate - Schedule of Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 602,352
Carrying amount of mortgages	561,761	$ 730,515	$ 752,129	$ 915,905
Reserves on impaired loans	21,700
Borrower A
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Face Amount of Mortgages	97,366
Carrying amount of mortgages	$ 97,443
Borrower A | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower A | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower B
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	94,175
Carrying amount of mortgages	$ 93,721
Borrower B | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower B | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower C
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	47,908
Carrying amount of mortgages	$ 48,536
Borrower C | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.75%
Borrower C | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.75%
Borrower D
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	52,056
Carrying amount of mortgages	$ 52,493
Borrower D | LIBOR | Minimum | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.00%
Borrower D | LIBOR | Minimum | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.00%
Borrower D | LIBOR | Maximum | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	12.35%
Borrower D | LIBOR | Maximum | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	12.35%
Borrower E
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	49,682
Carrying amount of mortgages	$ 49,539
Borrower E | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.75%
Borrower E | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.75%
Borrower F
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	12,605
Carrying amount of mortgages	$ 12,543
Borrower F | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.00%
Borrower F | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.00%
Borrower G
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	46,592
Carrying amount of mortgages	$ 46,308
Borrower G | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower G | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower H
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	38,912
Carrying amount of mortgages	$ 38,614
Borrower H | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower H | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower I
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	34,301
Carrying amount of mortgages	$ 34,158
Borrower I | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	5.75%
Borrower I | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	5.75%
Borrower J
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	35,656
Carrying amount of mortgages	$ 35,640
Borrower J | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower J | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower K
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	56,341
Carrying amount of mortgages	$ 16,119
Borrower K | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	3.00%
Borrower K | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	3.00%
Senior mortgages individually less than 3 percent
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 25,884
Carrying amount of mortgages	$ 25,769
Senior mortgages individually less than 3 percent | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	9.68%
Senior mortgages individually less than 3 percent | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	9.68%
Senior mortgages individually less than 3 percent | LIBOR | Minimum | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.00%
Senior mortgages individually less than 3 percent | LIBOR | Minimum | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.00%
Senior mortgages individually less than 3 percent | LIBOR | Maximum | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Senior mortgages individually less than 3 percent | LIBOR | Maximum | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Senior mortgages
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 591,478
Carrying amount of mortgages	550,883
Subordinate mortgages individually less than 3 percent
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	10,874
Carrying amount of mortgages	$ 10,878
Subordinate mortgages individually less than 3 percent | Minimum | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	6.80%
Subordinate mortgages individually less than 3 percent | Minimum | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	6.80%
Subordinate mortgages individually less than 3 percent | Maximum | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	14.00%
Subordinate mortgages individually less than 3 percent | Maximum | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	14.00%
Subordinate mortgages
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 10,874
Carrying amount of mortgages	$ 10,878

X

- Definition

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.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 948
-SubTopic 310
-Section S99
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Amount of prior lien on real estate securing 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 E
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column E))
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- Definition

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Amount of 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 FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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Amount 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, written down.

+ References

Reference 1: 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(Footnote 7))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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