Discontinued Operations (Operating Results Relating to Assets Disposed) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Discontinued Operations
Rental revenue	$ 1,050	$ 5,907	$ 5,053	$ 9,122
Tenant reimbursements	62	3,021	2,408	4,403
Other income			4	31
Total revenue	1,112	8,928	7,465	13,556
Property operating expense	66	4,236	2,821	7,746
Other expense	41	108	89	221
Transaction costs		37		7,270
Impairment charges			1,800
Interest expense, net		3,262	21	5,588
Costs associated with loan refinancing		4,236	225	4,236
Depreciation and amortization	19	2,557	1,876	3,884
Income (loss) before gain on acquisition and gain on sale of real estate	986	(5,508)	633	(15,389)
Gain on acquisition				8,468
Gain (loss) on sale of real estate		(934)	18,293	(934)
Net income (loss)	$ 986	$ (6,442)	$ 18,926	$ (7,855)

Costs associated with loan refinancing related to discontinued operations.

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Gain (Loss) On Business Combinations

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Other income (loss) amounts, net of tax expense or benefit, relating to a disposal group that is classified as a component of the entity, exclusive of the following elsewhere enumerated categories: 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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Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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Amount, if any, of interest expense allocated to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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