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Real Estate Properties - Income Statement Information for Disposal of Property (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations $ 462 $ (154) $ 173 $ (429)
Discontinued Operations, Held-for-sale | Discontinued operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Rental income 4 6 17 62
Real estate taxes (40) (27) (88) (73)
Utility expenses (17) (34) (97) (113)
Other operating expenses (87) (70) (202) (219)
General and administrative (17) (29) (76) (86)
Increase in carrying value of property 619 0 619 0
Income (loss) from discontinued operations $ 462 $ (154) $ 173 $ (429)