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Sale of Property (Details) - USD ($)		3 Months Ended
	Jan. 30, 2018	Mar. 31, 2018
Sale of Property
Total sales price, net of closing costs		$ 8,958,000
Sale of real estate | Retail Property, Fort Bend, Texas
Sale of Property
Gain (loss) on Sale of Real Estate, Net	$ 2,408,000
Sale of real estate | Retail Property, Fort Bend, Texas | Non-Controlling Interests in Consolidated Joint Ventures
Sale of Property
Non-controlling interest's share of the gain	$ 776,000
Consolidated Joint Venture | Sale of real estate | Retail Property, Fort Bend, Texas | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Property
Ownership interest in consolidated joint venture of the company (as a percent)	85.00%
Total sales price, net of closing costs	$ 8,958,000

X

- Definition

The parent entity's controlling interest held in a consolidated entity, expressed as a percentage.

+ References

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- Definition

Income (loss) from sale of consolidated JV property attributable to noncontrolling interest.

+ References

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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-Section 45
-Paragraph 12
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