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 6 Months Ended
Jun. 30, 2013
segments
Jun. 30, 2012
Jun. 30, 2013
segments
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting [Abstract]          
Number of primary office property segments 10   10    
Segment financial information for real estate operations          
Revenues from real estate operations $ 125,275 $ 123,968 $ 247,352 $ 249,272  
Property operating expenses 44,654 44,048 88,720 90,594  
NOI from real estate operations 80,621 79,920 158,632 158,678  
Additions to long-lived assets 11,782 9,726      
Transfers from non-operating properties 23,162 66,371      
Segment assets 3,699,635 3,715,075 3,699,635 3,715,075 3,653,759
Operating Segment Total
          
Segment financial information for real estate operations          
Revenues from real estate operations     247,352 249,272  
Property operating expenses     88,720 90,594  
NOI from real estate operations     158,632 158,678  
Additions to long-lived assets     17,636 14,304  
Transfers from non-operating properties     154,758 101,202  
Segment assets 3,048,562 2,982,956 3,048,562 2,982,956  
Baltimore and Washington Corridor
          
Segment financial information for real estate operations          
Revenues from real estate operations 57,387 55,677 113,823 111,927  
Property operating expenses 18,984 18,469 38,250 38,143  
NOI from real estate operations 38,403 37,208 75,573 73,784  
Additions to long-lived assets 4,094 3,075 6,825 4,939  
Transfers from non-operating properties 5,899 4,463 28,564 30,057  
Segment assets 1,218,310 1,227,287 1,218,310 1,227,287  
Northern Virginia
          
Segment financial information for real estate operations          
Revenues from real estate operations 22,988 19,051 45,930 37,611  
Property operating expenses 8,204 6,925 16,021 14,155  
NOI from real estate operations 14,784 12,126 29,909 23,456  
Additions to long-lived assets 2,696 719 4,240 2,380  
Transfers from non-operating properties 1,015 0 10,854 0  
Segment assets 571,851 474,959 571,851 474,959  
San Antonio
          
Segment financial information for real estate operations          
Revenues from real estate operations 8,364 7,830 16,121 15,438  
Property operating expenses 4,478 3,964 8,366 7,726  
NOI from real estate operations 3,886 3,866 7,755 7,712  
Additions to long-lived assets 7 259 17 259  
Transfers from non-operating properties 0 102 0 464  
Segment assets 118,827 120,069 118,827 120,069  
Washington, DC - Capitol Riverfront
          
Segment financial information for real estate operations          
Revenues from real estate operations 4,177 4,232 8,421 8,126  
Property operating expenses 1,874 1,676 3,823 3,561  
NOI from real estate operations 2,303 2,556 4,598 4,565  
Additions to long-lived assets 241 431 398 (298)  
Transfers from non-operating properties 0 0 0 0  
Segment assets 101,476 107,390 101,476 107,390  
St. Mary's and King George Counties
          
Segment financial information for real estate operations          
Revenues from real estate operations 4,093 4,139 8,085 8,351  
Property operating expenses 1,223 1,071 2,416 2,283  
NOI from real estate operations 2,870 3,068 5,669 6,068  
Additions to long-lived assets 729 293 1,004 460  
Transfers from non-operating properties 6 (362) 12 194  
Segment assets 97,084 98,779 97,084 98,779  
Greater Baltimore
          
Segment financial information for real estate operations          
Revenues from real estate operations 10,824 14,664 21,543 30,036  
Property operating expenses 4,097 5,611 8,265 11,372  
NOI from real estate operations 6,727 9,053 13,278 18,664  
Additions to long-lived assets (648) 3,616 54 4,335  
Transfers from non-operating properties (9) 29 104 394  
Segment assets 313,788 369,497 313,788 369,497  
Suburban Maryland
          
Segment financial information for real estate operations          
Revenues from real estate operations 2,253 4,560 4,477 10,309  
Property operating expenses 744 1,857 1,531 4,316  
NOI from real estate operations 1,509 2,703 2,946 5,993  
Additions to long-lived assets 26 412 55 1,183  
Transfers from non-operating properties 188 546 520 881  
Segment assets 53,074 78,736 53,074 78,736  
Colorado Springs
          
Segment financial information for real estate operations          
Revenues from real estate operations 6,519 6,149 13,252 12,602  
Property operating expenses 2,195 2,015 4,643 4,322  
NOI from real estate operations 4,324 4,134 8,609 8,280  
Additions to long-lived assets 595 687 910 786  
Transfers from non-operating properties 896 1,980 2,680 2,296  
Segment assets 172,637 181,808 172,637 181,808  
Greater Philadelphia
          
Segment financial information for real estate operations          
Revenues from real estate operations 2,784 2,458 5,271 4,630  
Property operating expenses 720 675 1,558 1,188  
NOI from real estate operations 2,064 1,783 3,713 3,442  
Additions to long-lived assets 285 90 285 90  
Transfers from non-operating properties 17,567 2,087 24,617 9,390  
Segment assets 102,098 111,145 102,098 111,145  
Other
          
Segment financial information for real estate operations          
Revenues from real estate operations 3,869 3,770 7,059 7,388  
Property operating expenses 617 714 1,013 1,402  
NOI from real estate operations 3,252 3,056 6,046 5,986  
Additions to long-lived assets 3,581 133 3,672 159  
Transfers from non-operating properties (3,281) (154) 20,958 (154)  
Segment assets 132,105 112,578 132,105 112,578  
Wholesale Data Center
          
Segment financial information for real estate operations          
Revenues from real estate operations 2,017 1,438 3,370 2,854  
Property operating expenses 1,518 1,071 2,834 2,126  
NOI from real estate operations 499 367 536 728  
Additions to long-lived assets 176 11 176 11  
Transfers from non-operating properties 881 57,680 66,449 57,680  
Segment assets $ 167,312 $ 100,708 $ 167,312 $ 100,708