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Fair Value Measurements (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | $ 69,692 | $ 1,238 | $ 72,138 | $ 1,238
Fair value measurement on a recurring basis |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 5,046 |  | 5,046 |
Fair value measurement on a nonrecurring basis | Projects in development or held for future development |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 9,117 |  | 9,117 |
Fair value measurement on a nonrecurring basis | Projects in development or held for future development | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 9,117 |  | 9,117 |
Fair value measurement on a nonrecurring basis | Northern Virginia Defense/IT and Fort Meade/BW Corridor | Assets held for sale, net |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | 14,100 |  |  |
Fair value measurement on a nonrecurring basis | Aberdeen, Maryland | Land in development or held for future development |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | 4,400 |  |  |
Fair value measurement on a nonrecurring basis | Aberdeen, Maryland | Other Segments | Operating properties, net |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | 34,400 |  |  |
Fair value measurement on a nonrecurring basis | Frederick, Maryland | Land in development or held for future development |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | 8,200 |  |  |
Fair value measurement on a nonrecurring basis | Greater Philadelphia, Pennsylvania | Regional Office | Assets held for sale, net |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | 6,200 |  |  |
Fair value measurement on a nonrecurring basis | Colorado Springs | Assets held for sale, net |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses |  |  | 3,400 |
Fair value measurement on a nonrecurring basis | White Marsh, Maryland | Regional Office | Assets held for sale, net |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses |  |  | 1,400 |
Assets held for sale, net | Fair value measurement on a nonrecurring basis |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 55,322 |  | 55,322 |
Assets held for sale, net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 55,322 |  | 55,322 |
Operating properties, net | Fair value measurement on a nonrecurring basis |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 13,700 |  | 13,700 |
Operating properties, net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | $ 13,700 |  | $ 13,700 |

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