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Properties, net (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Tenant relationship value | Dec. 31, 2013 In-place lease value | Dec. 31, 2013 Above-market leases | Jul. 11, 2012 13857 McLearen Road sqft | Jul. 11, 2012 13857 McLearen Road Tenant relationship value | Jul. 11, 2012 13857 McLearen Road In-place lease value | Jul. 11, 2012 13857 McLearen Road Above-market leases | Dec. 31, 2013 Newly-constructed properties placed in service sqft Property | Dec. 31, 2012 Newly-constructed properties placed in service sqft Property | Dec. 31, 2012 Newly-constructed properties placed in service Northern Virginia Property | Dec. 31, 2012 Newly-constructed properties placed in service Baltimore and Washington Corridor Property | Dec. 31, 2012 Newly-constructed properties placed in service Greater Baltimore Property | Dec. 31, 2013 Properties under construction or contractually committed for construction sqft Property | Dec. 31, 2013 Properties under construction or contractually committed for construction Northern Virginia Property | Dec. 31, 2013 Properties under construction or contractually committed for construction Huntsville Property | Dec. 31, 2013 Properties under construction or contractually committed for construction Baltimore and Washington Corridor Property | Dec. 31, 2013 Properties under construction or contractually committed for construction San Antonio Property | Dec. 31, 2013 Properties under redevelopment sqft Property | Dec. 31, 2013 Properties under redevelopment Baltimore and Washington Corridor Property | Dec. 31, 2013 Properties under redevelopment Greater Philadelphia Property
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet of Properties Placed in Service |  |  |  |  |  |  |  |  |  | 812,000 | 371,000 |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties Placed In Service |  |  |  |  |  |  |  |  |  | 8 | 4 |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 | 1 | 7 | 3 | 1 | 2 | 1 | 3 | 1 | 2
Square footage of real estate properties (in square feet) |  |  |  |  |  | 202,000 |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  | 376,000 |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired property, percentage leased (as a percent) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land, operating properties |  |  |  |  |  | $ 3,507 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Building and improvements |  |  |  |  |  | 30,177 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on real estate acquisitions |  |  |  |  |  | 14,993 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  | 48,677 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Below market leases |  |  |  |  |  | (369) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition costs |  |  |  |  |  | 48,308 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on real estate acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount |  |  |  |  |  | 14,993 | 7,472 | 7,109 | 412 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period of intangible assets | 10 years |  | 7 years | 6 years | 3 years | 7 years | 10 years | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Costs expensed in connection with acquisition of operating properties |  | $ 229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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