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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 |

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 Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b -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. + 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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