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Combined Guarantor Subsidiaries - Mortgage and Other Notes Receivable - Summary (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Mortgage and Other Notes Receivable [Line Items]
Balance	$ 2,928,000	$ 4,662,000
Mortgage Receivable
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)	3.48%
Balance	$ 1,100,000	2,637,000
Other Notes Receivable
Mortgage and Other Notes Receivable [Line Items]
Balance	1,828,000	2,025,000
Guarantor Subsidiaries
Mortgage and Other Notes Receivable [Line Items]
Balance	73,786,000	75,016,000
Guarantor Subsidiaries | Mortgage Receivable
Mortgage and Other Notes Receivable [Line Items]
Balance	$ 73,786,000	$ 73,786,000
Guarantor Subsidiaries | Mortgage Receivable | The Promenade
Mortgage and Other Notes Receivable [Line Items]
Maturity Date	2020-06
Interest Rate (as a percent)	5.00%	5.00%
Balance	$ 47,514,000	$ 47,514,000
Guarantor Subsidiaries | Mortgage Receivable | Hamilton Corner
Mortgage and Other Notes Receivable [Line Items]
Maturity Date	2020-08
Interest Rate (as a percent)	5.67%	5.67%
Balance	$ 14,295,000	$ 14,295,000
Guarantor Subsidiaries | Mortgage Receivable | The Terrace
Mortgage and Other Notes Receivable [Line Items]
Maturity Date	2020-06
Interest Rate (as a percent)	7.25%	7.25%
Balance	$ 11,977,000	$ 11,977,000
Guarantor Subsidiaries | Other Notes Receivable
Mortgage and Other Notes Receivable [Line Items]
Balance	$ 73,786,000	$ 75,016,000
Guarantor Subsidiaries | Other Notes Receivable | Community improvement district
Mortgage and Other Notes Receivable [Line Items]
Maturity Date	2028-08
Interest Rate (as a percent)	5.25%	6.75%
Balance		$ 1,230,000

X

- Definition

Notes receivable maturity month and year.

+ 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

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+ References

No definition available.

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- Definition

Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-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

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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