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Information by Business Segment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 segment | Dec. 31, 2010 | Dec. 31, 2009
Information by Business Segment |  |  |
Number of primary office property segments | 9 |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | $ 495,832 | $ 461,728 | $ 426,855
Property operating expenses | 196,016 | 179,763 | 157,406
NOI from real estate operations | 299,816 | 281,965 | 269,449
Segment assets | 3,867,524 | 3,844,517 |
Operating Segment Total |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 495,832 | 461,728 | 426,855
Property operating expenses | 196,016 | 179,763 | 157,406
NOI from real estate operations | 299,816 | 281,965 | 269,449
Additions to properties, net | 330,966 | 525,410 | 331,001
Segment assets | 3,867,524 | 3,844,517 | 3,380,022
Baltimore/Washington Corridor |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 218,051 | 207,456 | 197,610
Property operating expenses | 81,859 | 77,340 | 72,902
NOI from real estate operations | 136,192 | 130,116 | 124,708
Additions to properties, net | 79,580 | 90,054 | 98,437
Segment assets | 1,401,082 | 1,392,524 | 1,332,579
Northern Virginia |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 74,214 | 75,063 | 79,132
Property operating expenses | 29,644 | 28,115 | 30,111
NOI from real estate operations | 44,570 | 46,948 | 49,021
Additions to properties, net | 54,565 | 108,438 | 7,673
Segment assets | 583,695 | 545,560 | 451,965
San Antonio |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 30,066 | 21,673 | 13,566
Property operating expenses | 14,864 | 10,447 | 4,479
NOI from real estate operations | 15,202 | 11,226 | 9,087
Additions to properties, net | 6,040 | 19,064 | 38,353
Segment assets | 161,419 | 154,787 | 134,986
Washington, DC - Capitol Riverfront |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 17,878 | 4,678 |
Property operating expenses | 6,888 | 1,758 |
NOI from real estate operations | 10,990 | 2,920 |
Additions to properties, net | 2,156 | 92,811 |
Segment assets | 108,366 | 120,492 |
St. Mary's and King George Counties |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 14,366 | 13,967 | 13,960
Property operating expenses | 4,320 | 4,340 | 3,491
NOI from real estate operations | 10,046 | 9,627 | 10,469
Additions to properties, net | 12,293 | 7,090 | 2,200
Segment assets | 105,599 | 99,412 | 94,732
Greater Baltimore |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 70,668 | 71,850 | 58,275
Property operating expenses | 30,597 | 31,491 | 25,560
NOI from real estate operations | 40,071 | 40,359 | 32,715
Additions to properties, net | 28,703 | 38,586 | 124,637
Segment assets | 506,415 | 585,001 | 569,590
Suburban Maryland |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 21,982 | 21,759 | 19,620
Property operating expenses | 9,517 | 9,657 | 8,393
NOI from real estate operations | 12,465 | 12,102 | 11,227
Additions to properties, net | 12,365 | 4,434 | 24,022
Segment assets | 173,749 | 176,776 | 179,453
Colorado Springs |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 23,860 | 24,897 | 23,125
Property operating expenses | 9,822 | 9,137 | 7,391
NOI from real estate operations | 14,038 | 15,760 | 15,734
Additions to properties, net | 4,108 | 3,499 | 22,593
Segment assets | 208,316 | 265,119 | 270,358
Greater Philadelphia |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 7,458 | 6,299 | 7,983
Property operating expenses | 1,814 | 2,274 | 1,271
NOI from real estate operations | 5,644 | 4,025 | 6,712
Additions to properties, net | 17,250 | 20,714 | 9,126
Segment assets | 138,623 | 122,734 | 105,372
Wholesale Data Center |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 5,054 | 1,062 |
Property operating expenses | 3,489 | 1,202 |
NOI from real estate operations | 1,565 | (140) |
Additions to properties, net | 67,909 | 125,636 |
Segment assets | 196,881 | 129,815 |
Other |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 12,235 | 13,024 | 13,584
Property operating expenses | 3,202 | 4,002 | 3,808
NOI from real estate operations | 9,033 | 9,022 | 9,776
Additions to properties, net | 45,997 | 15,084 | 3,960
Segment assets | $ 283,379 | $ 252,297 | $ 240,987

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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 SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Topic 210 -SubTopic 10 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 -Section S99 -Name Accounting Standards Codification -Publisher FASB -Paragraph 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 5: 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 + Details
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- Definition The cash outflow from the acquisition of a piece of land and anything permanently fixed to it, including buildings, structures on it and so forth, and payments to develop real estate assets by adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements. Including real estate intended to generate income for the owner; excluding real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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