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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 12, 2013 December 2013 Colorado Springs Portfolio Disposition Property	Dec. 23, 2013 Baltimore and Washington Corridor Property	Dec. 23, 2013 Colorado Springs Property
Properties
Number of properties sold			15
Number of properties transferred				9	5
Revenue from real estate operations	$ 19	$ 10,120
Property operating expenses	20	(3,678)
Depreciation and amortization	0	(1,242)
Impairment losses	(1)	(1,857)
General, administrative and leasing expenses	0	(1)
Interest expense	0	(2,081)
Loss on sales of real estate	(4)	0
Loss on early extinguishment of debt	(23)	0
Discontinued operations	$ 11	$ 1,261

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- Definition

Amount, if any, of gain on sales of real estate allocated to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of depreciation and amortization costs attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of gain or loss on early extinguishment of debt attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of property operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Disposal Group Including Discontinued Operations, General and Administrative and Leasing Expenses

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Represents the aggregate impairment losses recognized during the period related to properties disposed or expected to be disposed that are included in discontinued operations.

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Represents the number of real estate properties sold during the period.

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Amount of interest expense allocated to disposal group, including a discontinued operation.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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