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Dispositions of properties (Details) - USD ($) $ in Thousands						3 Months Ended		6 Months Ended
	Apr. 05, 2016	Dec. 09, 2015	May 13, 2015	Mar. 31, 2015	Feb. 23, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Gain (loss) on sale of property
Gain (loss) on sale of property						$ (643)	$ 948	$ (643)	$ 11,410
Asset held for sale						$ 9,275		$ 9,275
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
Office Property in San Jose, California | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property		$ 12,300
Office Property In Maryland Heights Missouri | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property	$ 4,200

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6390208&loc=d3e400-110220

+ Details

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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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