Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets (Details 2)

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Real Estate and Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Company allocated the purchase price of the properties acquired    
Total Purchase Price $ 5,650 $ 10,775
Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Total Purchase Price 5,650  
Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Total Purchase Price   10,775
Customer Relationships [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 259 499
Customer Relationships [Member] | Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 259  
Customer Relationships [Member] | Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired   499
Land [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,627 706
Land [Member] | Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,627  
Land [Member] | Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired   706
Building [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 2,735 6,551
Building [Member] | Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 2,735  
Building [Member] | Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired   6,551
Tenant Improvements [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 282 1,307
Tenant Improvements [Member] | Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 282  
Tenant Improvements [Member] | Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,307
In-place Leases [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 558 804
In-place Leases [Member] | Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 558  
In-place Leases [Member] | Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired   804
Leasing Costs [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 189 908
Leasing Costs [Member] | Egg Harbor Township, NJ [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired 189  
Leasing Costs [Member] | Ashburn, Virginia [Member]
    
Company allocated the purchase price of the properties acquired    
Fair value of acquired assets and liabilities assumed related to the properties acquired   $ 908