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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 Reportable_Segments | Dec. 31, 2010 | Dec. 31, 2009
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ 4,793,080 |  |  |  |  |  | $ 4,834,111 |  |  |  |  |  | $ 4,793,080 | $ 4,834,111 | $ 4,512,618
Construction-in-progress | 25,083 |  |  |  |  |  | 33,322 |  |  |  |  |  | 25,083 | 33,322 | 271,962
Land inventory | 109,008 |  |  |  |  |  | 110,055 |  |  |  |  |  | 109,008 | 110,055 | 97,368
Total revenue | 146,609 | 144,308 | 144,094 | [1] | 146,794 | [2] | 146,084 | 140,179 | 134,191 | [1] | 139,502 | [2] | 581,805 | 559,956 | 567,920
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 233,811 | 227,341 | 227,160
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 347,994 | 332,615 | 340,760
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 1,218,071 |  |  |  |  |  | 1,199,957 |  |  |  |  |  | 1,218,071 | 1,199,957 | 1,219,391
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 158,248 | 152,380 | 157,616
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 58,440 | 59,065 | 56,297
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 99,808 | 93,315 | 101,319
Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 953,870 |  |  |  |  |  | 911,354 |  |  |  |  |  | 953,870 | 911,354 | 490,602
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 |
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 125,366 | 92,110 | 73,534
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 48,792 | 37,896 | 31,479
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 76,574 | 54,214 | 42,055
Metropolitan, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 1,255,803 |  |  |  |  |  | 1,359,776 |  |  |  |  |  | 1,255,803 | 1,359,776 | 1,372,213
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 128,456 | 137,923 | 140,438
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 47,786 | 48,318 | 52,899
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 80,670 | 89,605 | 87,539
New Jersey/ Delaware [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 545,657 |  |  |  |  |  | 568,413 |  |  |  |  |  | 545,657 | 568,413 | 605,181
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 81,629 | 87,711 | 98,344
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 40,500 | 44,137 | 45,421
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 41,129 | 43,574 | 52,923
Richmond, Virginia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 307,698 |  |  |  |  |  | 294,406 |  |  |  |  |  | 307,698 | 294,406 | 301,474
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 36,789 | 36,032 | 36,201
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 14,727 | 14,010 | 13,871
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 22,062 | 22,022 | 22,330
Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 257,694 |  |  |  |  |  | 254,019 |  |  |  |  |  | 257,694 | 254,019 | 268,806
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 30,895 | 32,049 | 31,311
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 13,048 | 13,401 | 14,351
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 17,847 | 18,648 | 16,960
California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 254,287 |  |  |  |  |  | 246,186 |  |  |  |  |  | 254,287 | 246,186 | 254,951
Construction-in-progress |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Land inventory |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 21,670 | 22,551 | 29,283
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | 11,507 | 11,852 | 14,735
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 10,163 | 10,699 | 14,548
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 | 0 | 0
Construction-in-progress | 25,083 |  |  |  |  |  | 33,322 |  |  |  |  |  | 25,083 | 33,322 | 271,962
Land inventory | 109,008 |  |  |  |  |  | 110,055 |  |  |  |  |  | 109,008 | 110,055 | 97,368
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | (1,248) | (800) | 1,193
Property operating expenses, real estate taxes and third party management expenses |  |  |  |  |  |  |  |  |  |  |  |  | (989) | (1,338) | (1,893)
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | $ (259) | $ 538 | $ 3,086
[1] | The consolidated statement of operations for the second quarter of 2011 also contained an out of period depreciation and amortization expense adjustment of $4.7 million relating to intangible assets representing tenant relationships and in-place leases that should have been written off in prior periods. This resulted in the overstatement of depreciation and amortization expense by $4.7 million million in the current year. During the year ended December 31, 2010, depreciation and amortization expense was overstated by $1.7 million and was understated by $1.4 million, $1.8 million, $1.7 million and $1.5 million during the years ended December 31, 2009, 2008, 2007, and 2006, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment during the current year.
[2] | During the first quarter of 2011, the Company recorded additional income of $0.5 million related to electricity charges in prior years that were under-billed to a certain tenant. This resulted in the overstatement of total revenue by $0.5 million during the current year and in the understatement of total revenue by $0.3 million and $0.2 million for the years ended December 31, 2009 and 2008, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment in the current year.

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 2 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 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Represents a total 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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