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Properties Held for Sale/Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed results of operations of the property held for sale        
Rental revenues $ 328 $ 328 $ 982 $ 980
Tenant expense reimbursements 41 52 125 158
Property operating expenses (52) (60) (150) (189)
Depreciation and amortization   (52) (104) (159)
Income from discontinued operations $ 317 $ 268 $ 853 $ 790