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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 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 | Jun. 30, 2014 Greater Baltimore Property
Properties |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  | 15 |  |  |
Number of properties transferred |  |  |  |  |  | 9 | 5 |
Revenue from real estate operations | $ 5 | $ 9,543 | $ 24 | $ 19,663 |  |  |  |
Property operating expenses | (84) | (3,321) | (64) | (6,999) |  |  |  |
Depreciation and amortization | 0 | (1,262) | 0 | (2,504) |  |  |  |
Impairment losses | (26) | (7,195) | (27) | (9,052) |  |  |  |
General, administrative and leasing expenses | 0 | 0 | 0 | (1) |  |  |  |
Interest expense | 0 | (2,267) | 0 | (4,348) |  |  |  |
Loss on sales of real estate | 0 | 0 | (4) | 0 |  |  |  |
Loss on early extinguishment of debt | (93) | 0 | (116) | 0 |  |  |  |
Discontinued operations | $ (198) | $ (4,502) | $ (187) | $ (3,241) |  |  |  |
Number of properties held for sale |  |  |  |  |  |  |  | 8

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