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.

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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- Definition

Carrying amount at the balance sheet date of mineral rights, or rights to extract a mineral from the earth or to receive payment in the form of a royalty for the extraction of minerals, net of amortization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Mineral Rights
-URI http://asc.fasb.org/extlink&oid=6919630

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Leasing Activity - Geographic Concentration (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Real Estate Held-for-sale	$ 12,679	$ 0
Mineral rights	$ 100
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Sales [Member] \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Sales [Member] \| Geographic Concentration Risk [Member] \| Missouri
Concentration Risk [Line Items]
Concentration Risk, Percentage	60.00%
Sales [Member] \| Geographic Concentration Risk [Member] \| Texas
Concentration Risk [Line Items]
Concentration Risk, Percentage	32.00%
Sales [Member] \| Geographic Concentration Risk [Member] \| Colorado
Concentration Risk [Line Items]
Concentration Risk, Percentage	8.00%
Sales [Member] \| Geographic Concentration Risk [Member] \| Chase Park Plaza [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	60.00%
Sales [Member] \| Geographic Concentration Risk [Member] \| Frisco Square [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%
Sales [Member] \| Geographic Concentration Risk [Member] \| Northborough Tower [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	11.00%
Sales [Member] \| Asset type \| Hotel
Concentration Risk [Line Items]
Concentration Risk, Percentage	68.00%
Sales [Member] \| Asset type \| Office Building [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	28.00%
Sales [Member] \| Asset type \| Multifamily [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	4.00%
Las Colinas Commons [Member]
Concentration Risk [Line Items]
Real Estate Held-for-sale	$ 2,700