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Dispositions and Discontinued Operations (Details) - USD ($) $ in Thousands							12 Months Ended
	Dec. 09, 2015	May. 13, 2015	Mar. 31, 2015	Feb. 23, 2015	Dec. 03, 2014	Oct. 29, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gain (loss) on sale of property
Gain (loss) on sale of property							$ 23,662	$ 940
Operating results for discontinued operations:
Net income (loss) from discontinued operations									$ 375
Discontinued Operations, Held-for-sale or Disposed of by Sale
Operating results for discontinued operations:
Rental revenue									991
Depreciation and amortization									(616)
Net income (loss) from discontinued operations									$ 375
Commercial property in Richardson, Texas. | Discontinued Operations, Disposed of by Sale
Gain (loss) on sale of property
Gain (Loss) on sale of properties						$ 2,200
Commercial property in Colorado Springs, CO | 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 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

X

- Definition

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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