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Dispositions of properties (Details) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended
	May. 13, 2015	Mar. 31, 2015	Feb. 23, 2015	Sep. 30, 2015	Sep. 30, 2015
Gain (loss) on sale of property
Gain (loss) on sale of property				$ 1	$ 11,411
Office Property in Plano, Texas | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property			$ 1,500
Office Property in Eden Prairie, Minnesota | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property		$ 9,000
Office Property in Charlotte, North Carolina | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property	$ 900

X

- Definition

This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 974



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.3-15.(a)(1)(ii))



-URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027

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- References

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