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Schedule IV - Mortgage Loans on Real Estate - Mortgage Loans on Real Estate (Details)
$ in Thousands

12 Months Ended

Dec. 31, 2017

USD ($)

Face Amount

$ 29,678

^[1]

Carrying Amount

21,469

^[1],[2]

Other Financing Loans [Member]

Face Amount

30,278

^[1]

Carrying Amount

$ 21,838

^[1],[2]

Retail Site [Member] | Toronto, ON [Member] | Borrower A [Member]

Interest Payment Rates

7.00%

Face Amount

$ 5,319

^[1]

Carrying Amount

$ 5,058

^[1],[2]

Retail Site [Member] | Westport, CT [Member] | Borrower B [Member]

Interest Payment Rates

6.50%

Face Amount

$ 5,014

^[1]

Carrying Amount

$ 5,014

^[1],[2]

Retail Site [Member] | Las Vegas, NV [Member] | Borrower C [Member]

Interest Payment Rates

12.00%

Face Amount

$ 3,075

^[1]

Carrying Amount

$ 3,075

^[1],[2]

Retail Site [Member] | Miami, FL [Member] | Borrower D [Member]

Interest Payment Rates

7.57%

Face Amount

$ 3,966

^[1]

Carrying Amount

$ 1,919

^[1],[2]

Retail Site [Member] | Miami, FL [Member] | Borrower E [Member]

Interest Payment Rates

7.57%

Face Amount

$ 4,201

^[1]

Carrying Amount

$ 1,850

^[1],[2]

Retail Site [Member] | Miami, FL [Member] | Borrower F [Member]

Interest Payment Rates

7.57%

Face Amount

$ 3,678

^[1]

Carrying Amount

$ 1,775

^[1],[2]

Nonretail [Member] | Other Financing Loans [Member]

Interest Payment Rates

2.28%

Face Amount

$ 600

^[1]

Carrying Amount

$ 369

^[1],[2]

Nonretail [Member] | Individually Less Than 3% [Member]

Interest Payment Rates

^[3],[4]

Face Amount

$ 2,475

^[1],[3]

Carrying Amount

$ 828

^[1],[2],[3]

Nonretail [Member] | Oakbrook Terrace, IL [Member] | Borrower G [Member]

Interest Payment Rates

6.00%

Face Amount

$ 1,950

^[1]

Carrying Amount

$ 1,950

^[1],[2]

[1]	The instruments actual cash flows are denominated in U.S. dollars and Canadian dollars as indicated by the geographic location above
[2]	The aggregate cost for Federal income tax purposes was approximately $21.8 million as of December 31, 2017.
[3]	Comprised of three separate loans with original loan amounts ranging from $0.1 million to $0.4 million.
[4]	Interest rates range from 6.88% to 7.41%.

X

- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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X

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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X

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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