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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 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
Properties |  |  |  |  |  |  |
Number of properties sold |  |  |  |  | 15 |  |
Number of properties transferred |  |  |  |  |  | 9 | 5
Revenue from real estate operations | $ (36) | $ 9,740 | $ (12) | $ 29,403 |  |  |
Property operating expenses | 175 | (3,524) | 111 | (10,523) |  |  |
Depreciation and amortization | 0 | (1,005) | 0 | (3,509) |  |  |
Impairment recoveries (losses) | 24 | (16,217) | (3) | (25,269) |  |  |
General, administrative and leasing expenses | 0 | 0 | 0 | (1) |  |  |
Interest expense | 0 | (1,968) | 0 | (6,316) |  |  |
Gain on sales of real estate | 28 | 0 | 24 | 0 |  |  |
Loss on early extinguishment of debt | 0 | 0 | (116) | 0 |  |  |
Discontinued operations | $ 191 | $ (12,974) | $ 4 | $ (16,215) |  |  |

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