Annual report pursuant to Section 13 and 15(d)

Information by Business Segment (Details)

v2.4.0.8
Information by Business Segment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
segment
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting [Abstract]      
Number of primary office property segments (in number of segments) 10    
Segment financial information for real estate operations      
Revenues from real estate operations $ 498,633 $ 493,100 $ 495,832
Property operating expenses 180,704 180,735 187,820
NOI from real estate operations 317,929 312,365 308,012
Segment assets 3,629,952 3,653,759  
Operating Segment Total
     
Segment financial information for real estate operations      
Revenues from real estate operations 498,633 493,100 495,832
Property operating expenses 180,704 180,735 187,820
NOI from real estate operations 317,929 312,365 308,012
Additions to long-lived assets 56,877 106,801 105,109
Transfers from non-operating properties 264,290 220,997 144,388
Segment assets 2,905,630 2,945,930 3,039,440
Baltimore and Washington Corridor
     
Segment financial information for real estate operations      
Revenues from real estate operations 237,869 238,488 237,162
Property operating expenses 80,554 83,050 86,782
NOI from real estate operations 157,315 155,438 150,380
Additions to long-lived assets 28,087 25,921 33,142
Transfers from non-operating properties 50,105 65,108 67,752
Segment assets 1,243,099 1,267,357 1,350,678
Northern Virginia
     
Segment financial information for real estate operations      
Revenues from real estate operations 92,010 79,574 74,214
Property operating expenses 31,973 29,103 28,518
NOI from real estate operations 60,037 50,471 45,696
Additions to long-lived assets 13,090 65,157 14,770
Transfers from non-operating properties 61,434 44,250 4
Segment assets 616,082 569,860 484,392
San Antonio
     
Segment financial information for real estate operations      
Revenues from real estate operations 33,060 32,018 30,066
Property operating expenses 17,631 16,499 14,371
NOI from real estate operations 15,429 15,519 15,695
Additions to long-lived assets 335 280 0
Transfers from non-operating properties 0 468 17,638
Segment assets 118,299 119,369 131,412
Huntsville
     
Segment financial information for real estate operations      
Revenues from real estate operations 5,050 3,867 1,368
Property operating expenses 1,282 689 226
NOI from real estate operations 3,768 3,178 1,142
Additions to long-lived assets 3,563 26 26,837
Transfers from non-operating properties 48,799 0 0
Segment assets 77,773 28,730 32,341
Washington, DC - Capitol Riverfront
     
Segment financial information for real estate operations      
Revenues from real estate operations 16,863 16,697 17,878
Property operating expenses 7,844 7,555 6,762
NOI from real estate operations 9,019 9,142 11,116
Additions to long-lived assets 2,604 317 2,794
Transfers from non-operating properties 0 0 0
Segment assets 98,962 104,544 111,318
St. Mary's and King George Counties
     
Segment financial information for real estate operations      
Revenues from real estate operations 16,568 16,392 14,366
Property operating expenses 5,028 4,745 4,142
NOI from real estate operations 11,540 11,647 10,224
Additions to long-lived assets 2,341 1,844 1,638
Transfers from non-operating properties 14 289 16,858
Segment assets 96,143 98,027 100,818
Greater Baltimore
     
Segment financial information for real estate operations      
Revenues from real estate operations 42,653 52,616 70,668
Property operating expenses 16,583 19,917 29,543
NOI from real estate operations 26,070 32,699 41,125
Additions to long-lived assets 2,913 9,690 21,086
Transfers from non-operating properties 360 37,558 16,307
Segment assets 303,823 320,548 402,067
Greater Philadelphia
     
Segment financial information for real estate operations      
Revenues from real estate operations 11,924 9,698 7,458
Property operating expenses 3,431 2,562 1,402
NOI from real estate operations 8,493 7,136 6,056
Additions to long-lived assets 406 286 516
Transfers from non-operating properties 28,034 10,626 5,446
Segment assets 104,657 78,798 102,572
Colorado Springs
     
Segment financial information for real estate operations      
Revenues from real estate operations 25,290 24,987 23,675
Property operating expenses 9,002 9,231 8,758
NOI from real estate operations 16,288 15,756 14,917
Additions to long-lived assets 2,940 2,929 4,085
Transfers from non-operating properties 5,438 4,295 214
Segment assets 0 175,830 181,384
Other
     
Segment financial information for real estate operations      
Revenues from real estate operations 10,075 12,116 13,923
Property operating expenses 1,016 2,569 3,887
NOI from real estate operations 9,059 9,547 10,036
Additions to long-lived assets 0 152 182
Transfers from non-operating properties 0 394 0
Segment assets 80,002 82,090 98,808
Operating Wholesale Data Center
     
Segment financial information for real estate operations      
Revenues from real estate operations 7,271 6,647 5,054
Property operating expenses 6,360 4,815 3,429
NOI from real estate operations 911 1,832 1,625
Additions to long-lived assets 598 199 59
Transfers from non-operating properties 70,106 58,009 20,169
Segment assets $ 166,790 $ 100,777 $ 43,650