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Schedule IV - Mortgage Loans on Real Estate - Mortgage Loans on Real Estate (Details) $ in Thousands | 12 Months Ended
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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%.

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- 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 + Details
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- 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 + Details
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