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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Reportable_Segments | Sep. 30, 2011 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments |  |  | 7 |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | $ 4,660,289 |  | $ 4,660,289 |  | $ 4,793,080
Construction-in-progress | 43,449 |  | 43,449 |  | 25,083
Land inventory | 95,500 |  | 95,500 |  | 109,008
Total revenue | 140,383 | 139,401 | 417,370 | 420,267 |
Property operating expenses, real estate taxes and third party management expenses | 56,067 | 55,371 | 164,172 | 169,117 |
Net operating income | 84,316 | 84,030 | 253,198 | 251,150 |
Pennsylvania Suburbs [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 1,174,597 |  | 1,174,597 |  | 1,218,071
Total revenue | 38,526 | 36,812 | 113,565 | 111,949 |
Property operating expenses, real estate taxes and third party management expenses | 13,588 | 13,493 | 39,643 | 42,112 |
Net operating income | 24,938 | 23,319 | 73,922 | 69,837 |
Philadelphia CBD [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 962,235 |  | 962,235 |  | 953,870
Total revenue | 33,025 | 31,097 | 98,086 | 93,520 |
Property operating expenses, real estate taxes and third party management expenses | 12,431 | 11,539 | 37,082 | 34,962 |
Net operating income | 20,594 | 19,558 | 61,004 | 58,558 |
Metropolitan, D.C. [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 1,189,014 |  | 1,189,014 |  | 1,255,803
Total revenue | 26,516 | 29,296 | 79,919 | 89,936 |
Property operating expenses, real estate taxes and third party management expenses | 10,637 | 10,868 | 31,158 | 34,002 |
Net operating income | 15,879 | 18,428 | 48,761 | 55,934 |
New Jersey/ Delaware [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 545,104 |  | 545,104 |  | 545,657
Total revenue | 20,553 | 20,743 | 61,442 | 60,554 |
Property operating expenses, real estate taxes and third party management expenses | 10,030 | 10,008 | 28,697 | 30,611 |
Net operating income | 10,523 | 10,735 | 32,745 | 29,943 |
Richmond, Virginia [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 308,371 |  | 308,371 |  | 307,698
Total revenue | 8,826 | 9,334 | 26,762 | 27,409 |
Property operating expenses, real estate taxes and third party management expenses | 3,762 | 3,664 | 10,875 | 10,666 |
Net operating income | 5,064 | 5,670 | 15,887 | 16,743 |
Austin, Texas [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 259,304 |  | 259,304 |  | 257,694
Total revenue | 8,275 | 7,453 | 23,959 | 23,203 |
Property operating expenses, real estate taxes and third party management expenses | 3,484 | 3,233 | 10,497 | 9,740 |
Net operating income | 4,791 | 4,220 | 13,462 | 13,463 |
California [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 221,664 |  | 221,664 |  | 254,287
Total revenue | 5,141 | 4,968 | 14,942 | 14,551 |
Property operating expenses, real estate taxes and third party management expenses | 2,639 | 3,009 | 7,498 | 8,015 |
Net operating income | 2,502 | 1,959 | 7,444 | 6,536 |
Corporate [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 0 |  | 0 |  | 0
Construction-in-progress | 43,449 |  | 43,449 |  | 25,083
Land inventory | 95,500 |  | 95,500 |  | 109,008
Total revenue | (479) | (302) | (1,305) | (855) |
Property operating expenses, real estate taxes and third party management expenses | (504) | (443) | (1,278) | (991) |
Net operating income | 25 | 141 | (27) | 136 |
Subsidiaries [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 4,660,289 |  | 4,660,289 |  | 4,793,080
Construction-in-progress | 43,449 |  | 43,449 |  | 25,083
Land inventory | 95,500 |  | 95,500 |  | 109,008
Total revenue | $ 140,383 | $ 139,401 | $ 417,370 | $ 420,267 |

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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