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Information by Business Segment (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of primary office property segments | segment | 10 |  | 10 |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | $ 128,195 | $ 115,964 | $ 250,905 | $ 240,860 |
Property operating expenses | 46,407 | 43,856 | 97,093 | 93,608 |
NOI from real estate operations | 81,788 | 72,108 | 153,812 | 147,252 |
Segment assets | 3,910,921 | 3,709,500 | 3,910,921 | 3,709,500 | $ 3,670,257
Operating Segment Total |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 128,195 | 115,964 | 250,905 | 240,860 |
Property operating expenses | 46,407 | 43,856 | 97,093 | 93,608 |
NOI from real estate operations | 81,788 | 72,108 | 153,812 | 147,252 |
Additions to long-lived assets | 94,715 | 14,096 | 166,686 | 27,825 |
Transfers from non-operating properties | 44,624 | 35,385 | 161,896 | 92,325 |
Segment assets | 3,218,657 | 2,951,299 | 3,218,657 | 2,951,299 |
Baltimore and Washington Corridor |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 60,611 | 57,456 | 122,403 | 118,569 |
Property operating expenses | 19,539 | 19,348 | 43,122 | 42,945 |
NOI from real estate operations | 41,072 | 38,108 | 79,281 | 75,624 |
Additions to long-lived assets | 5,141 | 6,289 | 8,586 | 12,030 |
Transfers from non-operating properties | 6,098 | 20,712 | 19,028 | 27,623 |
Segment assets | 1,279,531 | 1,259,974 | 1,279,531 | 1,259,974 |
Northern Virginia |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 24,393 | 20,898 | 46,142 | 45,866 |
Property operating expenses | 8,687 | 7,651 | 17,808 | 16,624 |
NOI from real estate operations | 15,706 | 13,247 | 28,334 | 29,242 |
Additions to long-lived assets | 84,582 | 4,805 | 87,403 | 8,300 |
Transfers from non-operating properties | 8,646 | 683 | 67,217 | 27,271 |
Segment assets | 780,250 | 634,834 | 780,250 | 634,834 |
San Antonio |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 10,204 | 8,758 | 19,375 | 17,237 |
Property operating expenses | 5,615 | 4,817 | 10,590 | 9,291 |
NOI from real estate operations | 4,589 | 3,941 | 8,785 | 7,946 |
Additions to long-lived assets | 0 | 0 | 21 | (6) |
Transfers from non-operating properties | 468 | 0 | 31,559 | 0 |
Segment assets | 147,844 | 117,328 | 147,844 | 117,328 |
Huntsville |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 2,658 | 2,404 | 5,104 | 4,959 |
Property operating expenses | 888 | 859 | 1,717 | 1,512 |
NOI from real estate operations | 1,770 | 1,545 | 3,387 | 3,447 |
Additions to long-lived assets | 208 | 334 | 291 | 2,841 |
Transfers from non-operating properties | 8,980 | 223 | 11,977 | 20,325 |
Segment assets | 107,677 | 97,838 | 107,677 | 97,838 |
Washington, DC - Capitol Riverfront |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 3,391 | 3,831 | 6,755 | 7,465 |
Property operating expenses | 2,061 | 1,754 | 3,875 | 3,519 |
NOI from real estate operations | 1,330 | 2,077 | 2,880 | 3,946 |
Additions to long-lived assets | 806 | 478 | 1,199 | 541 |
Transfers from non-operating properties | 0 | 0 | 0 | 0 |
Segment assets | 94,099 | 97,136 | 94,099 | 97,136 |
St. Mary's and King George Counties |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 3,795 | 4,202 | 7,696 | 8,518 |
Property operating expenses | 1,329 | 1,289 | 2,913 | 2,793 |
NOI from real estate operations | 2,466 | 2,913 | 4,783 | 5,725 |
Additions to long-lived assets | 963 | 943 | 2,163 | 1,782 |
Transfers from non-operating properties | 0 | 0 | 0 | 0 |
Segment assets | 100,665 | 95,553 | 100,665 | 95,553 |
Greater Baltimore |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 12,889 | 11,024 | 24,374 | 22,520 |
Property operating expenses | 4,909 | 4,500 | 9,906 | 9,976 |
NOI from real estate operations | 7,980 | 6,524 | 14,468 | 12,544 |
Additions to long-lived assets | 2,476 | 1,242 | 66,080 | 2,254 |
Transfers from non-operating properties | 12 | 2,953 | 12 | 3,027 |
Segment assets | 332,973 | 300,139 | 332,973 | 300,139 |
Greater Philadelphia |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 3,886 | 2,366 | 7,110 | 5,706 |
Property operating expenses | 941 | 1,144 | 2,316 | 2,444 |
NOI from real estate operations | 2,945 | 1,222 | 4,794 | 3,262 |
Additions to long-lived assets | 284 | 88 | 578 | 99 |
Transfers from non-operating properties | 5,218 | 10,198 | 16,716 | 13,374 |
Segment assets | 123,112 | 104,436 | 123,112 | 104,436 |
Other |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 2,548 | 2,533 | 5,091 | 5,127 |
Property operating expenses | 217 | 613 | 413 | 935 |
NOI from real estate operations | 2,331 | 1,920 | 4,678 | 4,192 |
Additions to long-lived assets | 177 | (93) | 257 | (38) |
Transfers from non-operating properties | 0 | 19 | 8 | 30 |
Segment assets | 76,943 | 78,918 | 76,943 | 78,918 |
Wholesale Data Center |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 3,820 | 2,492 | 6,855 | 4,893 |
Property operating expenses | 2,221 | 1,881 | 4,433 | 3,569 |
NOI from real estate operations | 1,599 | 611 | 2,422 | 1,324 |
Additions to long-lived assets | 78 | 10 | 108 | 22 |
Transfers from non-operating properties | 15,202 | 597 | 15,379 | 675 |
Segment assets | $ 175,563 | $ 165,143 | $ 175,563 | $ 165,143 |

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