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Discontinued Operations (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 23, 2013 Property | Dec. 12, 2013 Property | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from real estate operations |  |  |  |  |  |  |  |  |  |  | $ 4 | $ (14) | $ 37,636
Property operating expenses |  |  |  |  |  |  |  |  |  |  | 6 | 135 | (13,505)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (4,505)
Impairment losses |  |  |  |  |  |  |  |  |  |  | (234) | (3) | (26,190)
General, administrative and leasing expenses |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (4)
Interest expense |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (8,221)
Gain on sales of real estate |  |  |  |  |  |  |  |  |  |  | 0 | 24 | 2,671
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 380 | (116) | 67,810
Discontinued operations |  |  | $ 0 | $ 0 | $ 394 | $ (238) | $ 22 | $ 191 | $ (198) | $ 11 | $ 156 | $ 26 | $ 55,692
December 2013 Colorado Springs Portfolio Disposition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | Property |  | 15 |  |  |  |  |  |  |  |  |  |  |
Baltimore/Washington Corridor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties transferred | Property | 9 |  |  |  |  |  |  |  |  |  |  |  |
Colorado Springs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties transferred | Property | 5 |  |  |  |  |  |  |  |  |  |  |  |

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