Quarterly report pursuant to Section 13 or 15(d)

Information by Business Segment (Details)

v2.4.0.6
Information by Business Segment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
segments
Jun. 30, 2011
Jun. 30, 2012
segments
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting [Abstract]          
Number of primary office property segments 10   10    
Segment financial information for real estate operations          
Revenues from real estate operations $ 123,968 $ 120,806 $ 249,272 $ 243,247  
Property operating expenses 45,159 44,673 93,546 94,825  
NOI from real estate operations 78,809 76,133 155,726 148,422  
Additions to long-lived assets 9,726 17,017 14,304 35,217  
Transfers from non-operating properties 66,371 15,954 101,202 45,211  
Segment assets 3,715,075 3,868,230 3,715,075 3,868,230 3,867,524
Operating Segment Total
         
Segment financial information for real estate operations          
Segment assets 2,982,956 3,026,262 2,982,956 3,026,262  
Baltimore and Washington Corridor
         
Segment financial information for real estate operations          
Revenues from real estate operations 55,677 52,860 111,927 106,112  
Property operating expenses 19,065 17,983 39,216 39,041  
NOI from real estate operations 36,612 34,877 72,711 67,071  
Additions to long-lived assets 3,075 4,816 4,939 11,221  
Transfers from non-operating properties 4,463 6,140 30,057 26,023  
Segment assets 1,227,287 1,193,626 1,227,287 1,193,626  
Northern Virginia
         
Segment financial information for real estate operations          
Revenues from real estate operations 19,051 18,445 37,611 36,719  
Property operating expenses 7,176 7,276 14,576 14,866  
NOI from real estate operations 11,875 11,169 23,035 21,853  
Additions to long-lived assets 719 2,781 2,380 4,814  
Transfers from non-operating properties 0 4 0 (3)  
Segment assets 474,959 485,927 474,959 485,927  
San Antonio
         
Segment financial information for real estate operations          
Revenues from real estate operations 7,830 7,089 15,438 14,752  
Property operating expenses 4,023 3,138 7,840 6,951  
NOI from real estate operations 3,807 3,951 7,598 7,801  
Additions to long-lived assets 259 0 259 0  
Transfers from non-operating properties 102 159 464 759  
Segment assets 120,069 115,149 120,069 115,149  
Washington, DC - Capitol Riverfront
         
Segment financial information for real estate operations          
Revenues from real estate operations 4,232 4,252 8,126 8,842  
Property operating expenses 1,716 1,657 3,626 3,284  
NOI from real estate operations 2,516 2,595 4,500 5,558  
Additions to long-lived assets 431 656 (298) 812  
Transfers from non-operating properties 0 0 0 0  
Segment assets 107,390 115,515 107,390 115,515  
St. Mary's and King George Counties
         
Segment financial information for real estate operations          
Revenues from real estate operations 4,139 3,564 8,351 7,098  
Property operating expenses 1,139 961 2,397 1,975  
NOI from real estate operations 3,000 2,603 5,954 5,123  
Additions to long-lived assets 293 461 460 841  
Transfers from non-operating properties (362) 0 194 0  
Segment assets 98,779 85,563 98,779 85,563  
Greater Baltimore
         
Segment financial information for real estate operations          
Revenues from real estate operations 14,664 17,846 30,036 35,458  
Property operating expenses 5,805 7,233 11,695 15,685  
NOI from real estate operations 8,859 10,613 18,341 19,773  
Additions to long-lived assets 3,616 4,115 4,335 12,203  
Transfers from non-operating properties 29 3,594 394 7,841  
Segment assets 369,497 459,601 369,497 459,601  
Suburban Maryland
         
Segment financial information for real estate operations          
Revenues from real estate operations 4,560 5,325 10,309 10,934  
Property operating expenses 1,882 2,178 4,403 4,839  
NOI from real estate operations 2,678 3,147 5,906 6,095  
Additions to long-lived assets 412 2,453 1,183 3,505  
Transfers from non-operating properties 546 31 881 385  
Segment assets 78,736 142,334 78,736 142,334  
Colorado Springs
         
Segment financial information for real estate operations          
Revenues from real estate operations 6,149 5,912 12,602 11,832  
Property operating expenses 2,194 1,980 4,579 4,323  
NOI from real estate operations 3,955 3,932 8,023 7,509  
Additions to long-lived assets 687 1,085 786 1,821  
Transfers from non-operating properties 1,980 2 2,296 2  
Segment assets 181,808 213,021 181,808 213,021  
Greater Philadelphia
         
Segment financial information for real estate operations          
Revenues from real estate operations 2,458 1,675 4,630 3,614  
Property operating expenses 732 345 1,347 763  
NOI from real estate operations 1,726 1,330 3,283 2,851  
Additions to long-lived assets 90 0 90 (4)  
Transfers from non-operating properties 2,087 6,024 9,390 3,550  
Segment assets 111,145 101,542 111,145 101,542  
Other
         
Segment financial information for real estate operations          
Revenues from real estate operations 3,770 2,562 7,388 5,400  
Property operating expenses 252 1,093 1,485 1,560  
NOI from real estate operations 3,518 1,469 5,903 3,840  
Additions to long-lived assets 133 650 159 4  
Transfers from non-operating properties (154) 0 (154) 0  
Segment assets 112,578 83,437 112,578 83,437  
Wholesale Data Center
         
Segment financial information for real estate operations          
Revenues from real estate operations 1,438 1,276 2,854 2,486  
Property operating expenses 1,175 829 2,382 1,538  
NOI from real estate operations 263 447 472 948  
Additions to long-lived assets 11 0 11 0  
Transfers from non-operating properties 57,680 0 57,680 6,654  
Segment assets $ 100,708 $ 30,547 $ 100,708 $ 30,547