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Combined Guarantor Subsidiaries - Mortgage and Other Notes Receivable - Summary (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgages | [1] | $ 5,818 | $ 7,672
Mortgages |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgages |  | 3,604 | 4,884
Other Notes Receivable |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgages |  | 2,214 | 2,788
Guarantor Subsidiaries |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgages |  | 64,002 | 76,747
Guarantor Subsidiaries | Mortgages |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgages |  | $ 62,772 | $ 75,517
Guarantor Subsidiaries | Mortgages | The Promenade |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.00% | 5.00%
Mortgages |  | $ 47,513 | $ 47,514
Guarantor Subsidiaries | Mortgages | Hamilton Corner |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.67% | 5.67%
Mortgages |  | $ 14,295 | $ 14,295
Guarantor Subsidiaries | Mortgages | The Forum at Grandview |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.25% | 5.25%
Mortgages |  | $ 0 | $ 12,400
Guarantor Subsidiaries | Mortgages | Village Square |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.00% | 4.00%
Mortgages |  | $ 964 | $ 1,308
Guarantor Subsidiaries | Other Notes Receivable |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgages |  | $ 1,230 | $ 1,230
Guarantor Subsidiaries | Other Notes Receivable | Community improvement district |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 7.50% | 7.50%
Mortgages |  | $ 1,230 | $ 1,230
[1] | As of September 30, 2019, includes $484,345 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $346,999 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7.

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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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