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Schedule IV - Mortgage Loans on Real Estate - Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Carrying amount |  | $ 14,448 | $ 21,838 | $ 23,197 | $ 23,824
Mortgage Loans [Member] |  |  |  |  |
Face amount |  | 20,392 |  |  |
Carrying amount | [1] | 13,993 |  |  |
Other Financing Loans [Member] |  |  |  |  |
Face amount |  | 21,167 |  |  |
Carrying amount | [1] | $ 14,448 |  |  |
Retail Site [Member] | Westport, CT [Member] | Borrower A [Member] | Mortgage Loans [Member] |  |  |  |  |
Interest rate |  | 6.50% |  |  |
Face amount |  | $ 5,014 |  |  |
Carrying amount | [1] | $ 5,014 |  |  |
Retail Site [Member] | Las Vegas, NV [Member] | Borrower B [Member] | Mortgage Loans [Member] |  |  |  |  |
Interest rate |  | 12.00% |  |  |
Face amount |  | $ 3,075 |  |  |
Carrying amount | [1] | $ 3,075 |  |  |
Retail Site [Member] | Miami, FL [Member] | Borrower C [Member] | Mortgage Loans [Member] |  |  |  |  |
Interest rate |  | 7.57% |  |  |
Face amount |  | $ 4,201 |  |  |
Carrying amount | [1] | $ 1,646 |  |  |
Retail Site [Member] | Miami, FL [Member] | Borrower D [Member] | Mortgage Loans [Member] |  |  |  |  |
Interest rate |  | 7.57% |  |  |
Face amount |  | $ 3,678 |  |  |
Carrying amount | [1] | $ 1,613 |  |  |
Nonretail [Member] | Mortgage Loans [Member] | Individually Less Than 3% [Member] |  |  |  |  |
Interest rate | [2],[3] |  |  |  |
Face amount | [2] | $ 2,474 |  |  |
Carrying amount | [1],[2] | $ 695 |  |  |
Nonretail [Member] | Other Financing Loans [Member] | Individually Less Than 3% [Member] |  |  |  |  |
Interest rate | [4],[5] |  |  |  |
Face amount | [4] | $ 775 |  |  |
Carrying amount | [1],[4] | $ 455 |  |  |
Nonretail [Member] | Oakbrook Terrace, IL [Member] | Borrower E [Member] | Mortgage Loans [Member] |  |  |  |  |
Interest rate |  | 6.00% |  |  |
Face amount |  | $ 1,950 |  |  |
Carrying amount | [1] | $ 1,950 |  |  |
[1] | The aggregate cost for Federal income tax purposes was approximately $14.4 million as of December 31, 2018.
[2] | Comprised of four separate loans with original loan amounts ranging from $0.5 million to $1.4 million.
[3] | Interest rates range from 6.88% to 7.41%.
[4] | Comprised of two separate loans with original loan amounts ranging from $0.2 million to $0.6 million.
[5] | Interest rates range from 2.28% to 6.85%.

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