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
Mar. 31, 2013
segments
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting [Abstract]      
Number of primary office property segments 10    
Segment financial information for real estate operations      
Revenues from real estate operations $ 122,077 $ 125,304  
Property operating expenses 44,066 46,546  
NOI from real estate operations 78,011 78,758  
Segment assets 3,685,099 3,797,368 3,653,759
Operating Segment Total
     
Segment financial information for real estate operations      
Revenues from real estate operations 122,077 125,304  
Property operating expenses 44,066 46,546  
NOI from real estate operations 78,011 78,758  
Additions to long-lived assets 5,854 4,578  
Transfers from non-operating properties 131,596 34,831  
Segment assets 3,055,876 3,007,147  
Baltimore and Washington Corridor
     
Segment financial information for real estate operations      
Revenues from real estate operations 56,436 56,250  
Property operating expenses 19,266 19,674  
NOI from real estate operations 37,170 36,576  
Additions to long-lived assets 2,731 1,864  
Transfers from non-operating properties 22,665 25,594  
Segment assets 1,226,544 1,231,949  
Northern Virginia
     
Segment financial information for real estate operations      
Revenues from real estate operations 22,942 18,560  
Property operating expenses 7,817 7,230  
NOI from real estate operations 15,125 11,330  
Additions to long-lived assets 1,544 1,661  
Transfers from non-operating properties 9,839 0  
Segment assets 574,970 480,457  
San Antonio
     
Segment financial information for real estate operations      
Revenues from real estate operations 7,757 7,608  
Property operating expenses 3,888 3,762  
NOI from real estate operations 3,869 3,846  
Additions to long-lived assets 10 0  
Transfers from non-operating properties 0 362  
Segment assets 119,145 120,024  
Washington, DC - Capitol Riverfront
     
Segment financial information for real estate operations      
Revenues from real estate operations 4,244 3,894  
Property operating expenses 1,949 1,885  
NOI from real estate operations 2,295 2,009  
Additions to long-lived assets 157 (729)  
Transfers from non-operating properties 0 0  
Segment assets 102,928 108,649  
St. Mary's and King George Counties
     
Segment financial information for real estate operations      
Revenues from real estate operations 3,992 4,212  
Property operating expenses 1,193 1,212  
NOI from real estate operations 2,799 3,000  
Additions to long-lived assets 275 167  
Transfers from non-operating properties 6 556  
Segment assets 97,346 99,946  
Greater Baltimore
     
Segment financial information for real estate operations      
Revenues from real estate operations 10,719 15,372  
Property operating expenses 4,168 5,761  
NOI from real estate operations 6,551 9,611  
Additions to long-lived assets 702 719  
Transfers from non-operating properties 113 365  
Segment assets 317,953 370,754  
Suburban Maryland
     
Segment financial information for real estate operations      
Revenues from real estate operations 2,224 5,749  
Property operating expenses 787 2,459  
NOI from real estate operations 1,437 3,290  
Additions to long-lived assets 29 771  
Transfers from non-operating properties 332 335  
Segment assets 53,250 147,197  
Colorado Springs
     
Segment financial information for real estate operations      
Revenues from real estate operations 6,733 6,453  
Property operating expenses 2,448 2,307  
NOI from real estate operations 4,285 4,146  
Additions to long-lived assets 315 99  
Transfers from non-operating properties 1,784 316  
Segment assets 178,622 181,241  
Greater Philadelphia
     
Segment financial information for real estate operations      
Revenues from real estate operations 2,487 2,172  
Property operating expenses 838 513  
NOI from real estate operations 1,649 1,659  
Additions to long-lived assets 0 0  
Transfers from non-operating properties 7,050 7,303  
Segment assets 85,017 109,432  
Other
     
Segment financial information for real estate operations      
Revenues from real estate operations 3,190 3,618  
Property operating expenses 396 688  
NOI from real estate operations 2,794 2,930  
Additions to long-lived assets 91 26  
Transfers from non-operating properties 24,239 0  
Segment assets 133,181 114,108  
Wholesale Data Center
     
Segment financial information for real estate operations      
Revenues from real estate operations 1,353 1,416  
Property operating expenses 1,316 1,055  
NOI from real estate operations 37 361  
Additions to long-lived assets 0 0  
Transfers from non-operating properties 65,568 0  
Segment assets $ 166,920 $ 43,390