Property Dispositions, Assets Held for Sale, and Discontinued Operations (Schedule of Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other income/(expense)
Operating loss	$ (1)	$ (3)	$ (1)	$ (3)
Loss from discontinued operations	(1)	(3)	(1)	(3)
Discontinued Operations [Member]
Revenues:
Tenant reimbursements	0	(3)	0	(3)
Revenue	0	(3)	0	(3)
Expenses:
Property operating costs	0	(1)	0	(1)
General and administrative	1	1	1	1
Expenses	1	0	1	0
Other income/(expense)
Operating loss	(1)	(3)	(1)	(3)
Loss from discontinued operations	$ (1)	$ (3)	$ (1)	$ (3)