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Properties, net (Details 3) (USD $) | 6 Months Ended
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Jun. 30, 2012
Disposals and Impairment Losses |  |
Aggregate net impairment losses recognized in connection with disposition plan | $ 8,900,000 |
Aggregate net impairment losses recognized in discontinued operation in connection with disposition plan | 11,200,000 |
Exit cost included in net impairment losses recognized in connection with disposition plan | 1,200,000 |
Net impairment losses on expected disposition of additional property | 5,100,000 |
Non-operating properties |  |
Dispositions |  |
Sale Price of Non-operating Properties | 26,800,000 |
Operating properties, net |  |
Dispositions |  |
Number of Buildings | 11 |
Total Rentable Square Feet | 785,000 |
Sale Price of Operating Properties | 107,407,000 |
Gain on Sale | 4,294,000 |
White Marsh Portfolio | Operating properties, net |  |
Dispositions |  |
Number of Buildings | 5 | [1]
Total Rentable Square Feet | 163,000 |
Sale Price of Operating Properties | 19,100,000 |
Gain on Sale | 2,445,000 |
Number of properties comprising White Marsh Professional Center | 3 |
1101 Sentry Gateway | Operating properties, net |  |
Dispositions |  |
Number of Buildings | 1 |
Total Rentable Square Feet | 95,000 |
Sale Price of Operating Properties | 13,500,000 |
Gain on Sale | 1,747,000 |
222 and 224 Schilling Circle | Operating properties, net |  |
Dispositions |  |
Number of Buildings | 2 |
Total Rentable Square Feet | 56,000 |
Sale Price of Operating Properties | 4,400,000 |
Gain on Sale | 102,000 |
15 and 45 West Gude Drive | Operating properties, net |  |
Dispositions |  |
Number of Buildings | 2 |
Total Rentable Square Feet | 231,000 |
Sale Price of Operating Properties | 49,107,000 |
Gain on Sale | 0 |
11800 Tech Road | Operating properties, net |  |
Dispositions |  |
Number of Buildings | 1 |
Total Rentable Square Feet | 240,000 |
Sale Price of Operating Properties | 21,300,000 |
Gain on Sale | $ 0 |
[1] | Includes three properties comprising the White Marsh Professional Center, 8615 Ridgely’s Choice and 8114 Sandpiper Circle.

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- Definition Represents the exit costs included in aggregate net impairment loss recognized during the period in connection with disposition plan. + References No definition available. + Details
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- Definition Represents the total gain recognized on properties sold during the period. + References No definition available. + Details
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- Definition Represents the aggregate net impairment loss recognized during the period in connection with disposition plan, including amounts in continuing and discontinued operations. + References No definition available. + Details
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- Definition Represents the aggregate net impairment loss recognized during the period in connection with disposition plan that is included in discontinued operations. + References No definition available. + Details
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- Definition Represents the impairment loss recognized during the period related to expected disposition of additional property, including amounts in continuing and discontinued operations. + References No definition available. + Details
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- Definition Represents the number of properties comprising one of the projects included in reported disposition. + References No definition available. + Details
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- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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