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Fair Value Measurements (Details 3) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) Property | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale, net | $ 0 |  |  |  | $ 42,226 |  |  |  |  |  |  |  | $ 0 | $ 42,226 |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  |  |  | 2,367 | 15,123 | $ 101,391 |
Revenues from real estate operations | $ 138,482 | $ 137,411 | $ 146,743 | $ 155,476 | 164,567 | $ 157,017 | $ 151,435 | $ 139,801 |  |  |  |  | $ 578,112 | 612,820 | 574,328 |
Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale, net |  |  |  |  | 42,226 |  |  |  |  |  |  |  |  | 42,226 |  |
Fort Meade/BW Corridor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | Property |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale, net |  |  |  |  |  |  |  |  | $ 94,700 | $ 161,500 | $ 300,600 | $ 225,900 |  |  | $ 94,700 | $ 96,800
Impairment losses |  |  |  |  |  |  |  |  |  | 11,500 |  | $ 2,400 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Disposed of by sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | 300 |  |  |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Operating properties, net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 3,850 |  |  |  |  |  |  |  |  | 3,850 |  |
Fair value measurement on a nonrecurring basis [Member] | Operating properties, net [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 3,850 |  |  |  |  |  |  |  |  | 3,850 |  |
Fair value measurement on a nonrecurring basis [Member] | Projects in development or held for future development [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 1,755 |  |  |  |  |  |  |  |  | 1,755 |  |
Fair value measurement on a nonrecurring basis [Member] | Projects in development or held for future development [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | 1,755 |  |  |  |  |  |  |  |  | $ 1,755 |  |
Fair value measurement on a nonrecurring basis [Member] | Northern Virginia Defense/IT and Fort Meade/Baltimore Washington Corridor [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 14,100 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  | 13,300 |  |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | 4,700 |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 4,400 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Frederick, Maryland [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 8,200 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Greater Philadelphia [Member] | Regional Office [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 6,200 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Colorado Springs, Colorado and White Marsh, Maryland [Member] | Regional Office [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 2,400 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | 1,300 | 10,000 |  |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] | Held-for-sale [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  | 2,900 |  |  |  |  |  |
Operating properties, net [Member] | Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | $ 34,400 |  |  |  |  |
Property Sales [Member] | Fair value measurement on a nonrecurring basis [Member] | Disposed of by sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | $ 54,100 | $ 210,700 |  |  |  |  |  |

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