Quarterly report pursuant to Section 13 or 15(d)

Information by Business Segment (Details)

v2.4.0.8
Information by Business Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
segment
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting [Abstract]      
Number of primary office property segments 10    
Segment financial information for real estate operations      
Revenues from real estate operations $ 124,896 $ 122,077  
Property operating expenses 49,752 44,066  
NOI from real estate operations 75,144 78,011  
Segment assets 3,605,897 3,685,099 3,629,952
Operating Segment Total
      
Segment financial information for real estate operations      
Revenues from real estate operations 124,896 122,077  
Property operating expenses 49,752 44,066  
NOI from real estate operations 75,144 78,011  
Additions to long-lived assets 13,729 5,854  
Transfers from non-operating properties 56,940 131,596  
Segment assets 2,932,749 3,055,876  
Baltimore and Washington Corridor
      
Segment financial information for real estate operations      
Revenues from real estate operations 61,113 58,660  
Property operating expenses 23,597 20,053  
NOI from real estate operations 37,516 38,607  
Additions to long-lived assets 5,741 2,760  
Transfers from non-operating properties (169) 22,997  
Segment assets 1,237,796 1,279,794  
Northern Virginia
      
Segment financial information for real estate operations      
Revenues from real estate operations 24,968 22,942  
Property operating expenses 8,973 7,817  
NOI from real estate operations 15,995 15,125  
Additions to long-lived assets 3,495 1,544  
Transfers from non-operating properties 26,588 9,839  
Segment assets 636,895 574,970  
San Antonio
      
Segment financial information for real estate operations      
Revenues from real estate operations 8,479 7,757  
Property operating expenses 4,474 3,888  
NOI from real estate operations 4,005 3,869  
Additions to long-lived assets (6) 10  
Transfers from non-operating properties 0 0  
Segment assets 117,812 119,145  
Huntsville
      
Segment financial information for real estate operations      
Revenues from real estate operations 2,555 740  
Property operating expenses 653 182  
NOI from real estate operations 1,902 558  
Additions to long-lived assets 2,507 0  
Transfers from non-operating properties 20,102 24,240  
Segment assets 99,378 52,361  
Washington, DC - Capitol Riverfront
      
Segment financial information for real estate operations      
Revenues from real estate operations 3,634 4,244  
Property operating expenses 1,765 1,949  
NOI from real estate operations 1,869 2,295  
Additions to long-lived assets 63 157  
Transfers from non-operating properties 0 0  
Segment assets 97,843 102,928  
St. Mary's and King George Counties
      
Segment financial information for real estate operations      
Revenues from real estate operations 4,316 3,992  
Property operating expenses 1,504 1,193  
NOI from real estate operations 2,812 2,799  
Additions to long-lived assets 839 275  
Transfers from non-operating properties 0 6  
Segment assets 95,645 97,346  
Greater Baltimore
      
Segment financial information for real estate operations      
Revenues from real estate operations 11,496 10,719  
Property operating expenses 5,476 4,168  
NOI from real estate operations 6,020 6,551  
Additions to long-lived assets 1,012 702  
Transfers from non-operating properties 7,154 113  
Segment assets 307,699 317,953  
Greater Philadelphia
      
Segment financial information for real estate operations      
Revenues from real estate operations 3,340 2,487  
Property operating expenses 1,300 838  
NOI from real estate operations 2,040 1,649  
Additions to long-lived assets 11 0  
Transfers from non-operating properties 3,176 7,050  
Segment assets 94,428 85,017  
Colorado Springs
      
Segment financial information for real estate operations      
Revenues from real estate operations 18 6,682  
Property operating expenses (9) 2,437  
NOI from real estate operations 27 4,245  
Additions to long-lived assets 0 315  
Transfers from non-operating properties 11 1,783  
Segment assets 7 177,728  
Other
      
Segment financial information for real estate operations      
Revenues from real estate operations 2,576 2,501  
Property operating expenses 331 225  
NOI from real estate operations 2,245 2,276  
Additions to long-lived assets 55 91  
Transfers from non-operating properties 0 0  
Segment assets 79,535 81,714  
Wholesale Data Center
      
Segment financial information for real estate operations      
Revenues from real estate operations 2,401 1,353  
Property operating expenses 1,688 1,316  
NOI from real estate operations 713 37  
Additions to long-lived assets 12 0  
Transfers from non-operating properties 78 65,568  
Segment assets $ 165,711 $ 166,920