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Information by Business Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 segment | Jun. 30, 2013 | Jun. 30, 2014 segment | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting [Abstract] |  |  |  |  |
Number of primary office property segments | 10 |  | 10 |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | $ 115,964 | $ 125,275 | $ 240,860 | $ 247,352 |
Property operating expenses | 43,856 | 44,654 | 93,608 | 88,720 |
NOI from real estate operations | 72,108 | 80,621 | 147,252 | 158,632 |
Additions to long-lived assets | 14,096 | 11,782 |  |  |
Transfers from non-operating properties | 35,385 | 23,162 |  |  |
Segment assets | 3,709,500 | 3,699,635 | 3,709,500 | 3,699,635 | 3,629,952
Operating Segment Total |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations |  |  | 240,860 | 247,352 |
Property operating expenses |  |  | 93,608 | 88,720 |
NOI from real estate operations |  |  | 147,252 | 158,632 |
Additions to long-lived assets |  |  | 27,825 | 17,636 |
Transfers from non-operating properties |  |  | 92,325 | 154,758 |
Segment assets | 2,951,299 | 3,048,562 | 2,951,299 | 3,048,562 |
Baltimore and Washington Corridor |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 57,456 | 59,640 | 118,569 | 118,300 |
Property operating expenses | 19,348 | 19,728 | 42,945 | 39,781 |
NOI from real estate operations | 38,108 | 39,912 | 75,624 | 78,519 |
Additions to long-lived assets | 6,289 | 4,120 | 12,030 | 6,880 |
Transfers from non-operating properties | 20,712 | 6,087 | 27,623 | 29,084 |
Segment assets | 1,259,974 | 1,271,384 | 1,259,974 | 1,271,384 |
Northern Virginia |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 20,898 | 22,988 | 45,866 | 45,930 |
Property operating expenses | 7,651 | 8,204 | 16,624 | 16,021 |
NOI from real estate operations | 13,247 | 14,784 | 29,242 | 29,909 |
Additions to long-lived assets | 4,805 | 2,696 | 8,300 | 4,240 |
Transfers from non-operating properties | 683 | 1,015 | 27,271 | 10,854 |
Segment assets | 634,834 | 571,851 | 634,834 | 571,851 |
San Antonio |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 8,758 | 8,364 | 17,237 | 16,121 |
Property operating expenses | 4,817 | 4,478 | 9,291 | 8,366 |
NOI from real estate operations | 3,941 | 3,886 | 7,946 | 7,755 |
Additions to long-lived assets | 0 | 7 | (6) | 17 |
Transfers from non-operating properties | 0 | 0 | 0 | 0 |
Segment assets | 117,328 | 118,827 | 117,328 | 118,827 |
Huntsville |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 2,404 | 1,359 | 4,959 | 2,099 |
Property operating expenses | 859 | 310 | 1,512 | 492 |
NOI from real estate operations | 1,545 | 1,049 | 3,447 | 1,607 |
Additions to long-lived assets | 334 | 3,497 | 2,841 | 3,497 |
Transfers from non-operating properties | 223 | (3,283) | 20,325 | 20,957 |
Segment assets | 97,838 | 51,663 | 97,838 | 51,663 |
Washington, DC - Capitol Riverfront |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 3,831 | 4,177 | 7,465 | 8,421 |
Property operating expenses | 1,754 | 1,874 | 3,519 | 3,823 |
NOI from real estate operations | 2,077 | 2,303 | 3,946 | 4,598 |
Additions to long-lived assets | 478 | 241 | 541 | 398 |
Transfers from non-operating properties | 0 | 0 | 0 | 0 |
Segment assets | 97,136 | 101,476 | 97,136 | 101,476 |
St. Mary's and King George Counties |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 4,202 | 4,093 | 8,518 | 8,085 |
Property operating expenses | 1,289 | 1,223 | 2,793 | 2,416 |
NOI from real estate operations | 2,913 | 2,870 | 5,725 | 5,669 |
Additions to long-lived assets | 943 | 729 | 1,782 | 1,004 |
Transfers from non-operating properties | 0 | 6 | 0 | 12 |
Segment assets | 95,553 | 97,084 | 95,553 | 97,084 |
Greater Baltimore |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 11,024 | 10,824 | 22,520 | 21,543 |
Property operating expenses | 4,500 | 4,097 | 9,976 | 8,265 |
NOI from real estate operations | 6,524 | 6,727 | 12,544 | 13,278 |
Additions to long-lived assets | 1,242 | (648) | 2,254 | 54 |
Transfers from non-operating properties | 2,953 | (9) | 3,027 | 104 |
Segment assets | 300,139 | 313,788 | 300,139 | 313,788 |
Greater Philadelphia |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 2,366 | 2,784 | 5,706 | 5,271 |
Property operating expenses | 1,144 | 720 | 2,444 | 1,558 |
NOI from real estate operations | 1,222 | 2,064 | 3,262 | 3,713 |
Additions to long-lived assets | 88 | 285 | 99 | 285 |
Transfers from non-operating properties | 10,198 | 17,567 | 13,374 | 24,617 |
Segment assets | 104,436 | 102,098 | 104,436 | 102,098 |
Colorado Springs |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | (12) | 6,469 | 6 | 13,151 |
Property operating expenses | 11 | 2,185 | 2 | 4,622 |
NOI from real estate operations | (23) | 4,284 | 4 | 8,529 |
Additions to long-lived assets | 0 | 595 | 0 | 910 |
Transfers from non-operating properties | 19 | 896 | 30 | 2,679 |
Segment assets | 0 | 171,745 | 0 | 171,745 |
Other |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 2,545 | 2,560 | 5,121 | 5,061 |
Property operating expenses | 602 | 317 | 933 | 542 |
NOI from real estate operations | 1,943 | 2,243 | 4,188 | 4,519 |
Additions to long-lived assets | (93) | 84 | (38) | 175 |
Transfers from non-operating properties | 0 | 2 | 0 | 2 |
Segment assets | 78,918 | 81,334 | 78,918 | 81,334 |
Wholesale Data Center |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 2,492 | 2,017 | 4,893 | 3,370 |
Property operating expenses | 1,881 | 1,518 | 3,569 | 2,834 |
NOI from real estate operations | 611 | 499 | 1,324 | 536 |
Additions to long-lived assets | 10 | 176 | 22 | 176 |
Transfers from non-operating properties | 597 | 881 | 675 | 66,449 |
Segment assets | $ 165,143 | $ 167,312 | $ 165,143 | $ 167,312 |

X
- Definition Represents the number of reportable primary office property segments. + References No definition available. + Details
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- Definition Costs incurred and are directly related to generating revenues from leased and rented property or equipment for the reportable segment. + References No definition available. + Details
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- Definition Revenue from real estate operations for the reportable segment less property operating expenses for the reportable segment. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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