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Combined Guarantor Subsidiaries - Mortgage and Other Notes Receivable - Summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgage and other notes receivable | [1] | $ 7,406 | $ 7,672
Mortgages |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgage and other notes receivable |  | 4,807 | 4,884
Other Notes Receivable |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgage and other notes receivable |  | 2,599 | 2,788
Guarantor Subsidiaries |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgage and other notes receivable |  | 76,729 | 76,747
Guarantor Subsidiaries | Mortgages |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgage and other notes receivable |  | $ 75,499 | $ 75,517
Guarantor Subsidiaries | Mortgages | The Promenade |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.00% | 5.00%
Mortgage and other notes receivable |  | $ 47,514 | $ 47,514
Guarantor Subsidiaries | Mortgages | Hamilton Corner |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.67% | 5.67%
Mortgage and other notes receivable |  | $ 14,295 | $ 14,295
Guarantor Subsidiaries | Mortgages | Forum at Grandview |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 5.25% | 5.25%
Mortgage and other notes receivable |  | $ 12,400 | $ 12,400
Guarantor Subsidiaries | Mortgages | Village Square |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Interest rate (as a percent) |  | 4.00% | 4.00%
Mortgage and other notes receivable |  | $ 1,290 | $ 1,308
Guarantor Subsidiaries | Other Notes Receivable |  |  |
Mortgage and Other Notes Receivable [Line Items] |  |  |
Mortgage and other notes receivable |  | $ 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%
Mortgage and other notes receivable |  | $ 1,230 | $ 1,230
[1] | As of March 31, 2019, includes $609,856 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $406,466 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 Mortgage and Other Notes Receivable [Line Items] + References No definition available. + 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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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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