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Fair Value Measurements (Details 3) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) Property
Fair value of impaired properties and other assets |  |  |
Impairment losses | $ 23,289 | $ 1,416 | $ 5,857
Exit costs included in impairment losses in connection with dispositions | 0 | 0 | 979
Fair value measurement on a recurring basis [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | 5,816 | 6,156 |
Fair value measurement on a nonrecurring basis [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Exit costs included in impairment losses in connection with dispositions |  |  | 419
Fair value measurement on a nonrecurring basis [Member] | Discontinued Operations [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | 15,200
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses | 23,500 | $ 1,400 |
Assets | 13,850 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | 13,850 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Indicative Bids [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | 24,423 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Comparable Sales Price [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | 10,850 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Colorado Springs [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses | 12,800 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses | 6,600 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses | 2,600 |  |
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Land controlled for future development [Member] | Northern Virginia [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses | 1,300 |  |
Assets Held-for-sale, Net [Member] | Fair value measurement on a nonrecurring basis [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | 21,423 |  |
Assets Held-for-sale, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | $ 21,423 |  |
Property Conveyances [Member] | Fair value measurement on a nonrecurring basis [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | 11,000
Exit costs included in impairment losses in connection with dispositions |  |  | 560
Other Properties with Shortened Holding Periods [Member] | Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | $ 5,900
Number of properties, shortened holding period | Property |  |  | 2

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