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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Reportable_Segments | Jun. 30, 2011 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments |  |  | 7 |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | $ 4,639,047 |  | $ 4,639,047 |  | $ 4,793,080
Construction-in-progress | 57,420 |  | 57,420 |  | 25,083
Land inventory | 109,564 |  | 109,564 |  | 109,008
Total revenue | 137,576 | 139,249 | 276,987 | 280,866 |
Property operating expenses, real estate taxes and third party management expenses | 53,304 | 54,407 | 108,105 | 113,746 |
Net operating income | 84,272 | 84,842 | 168,882 | 167,120 |
Pennsylvania Suburbs [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 1,167,390 |  | 1,167,390 |  | 1,218,071
Total revenue | 36,934 | 37,159 | 75,039 | 75,136 |
Property operating expenses, real estate taxes and third party management expenses | 12,711 | 12,825 | 26,055 | 28,617 |
Net operating income | 24,223 | 24,334 | 48,984 | 46,519 |
Philadelphia CBD [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 955,563 |  | 955,563 |  | 953,870
Total revenue | 31,911 | 30,573 | 65,061 | 62,423 |
Property operating expenses, real estate taxes and third party management expenses | 11,965 | 11,203 | 24,650 | 23,423 |
Net operating income | 19,946 | 19,370 | 40,411 | 39,000 |
Metropolitan, D.C. [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 1,182,895 |  | 1,182,895 |  | 1,255,803
Total revenue | 26,967 | 30,309 | 53,403 | 60,640 |
Property operating expenses, real estate taxes and third party management expenses | 10,454 | 11,486 | 20,520 | 23,135 |
Net operating income | 16,513 | 18,823 | 32,883 | 37,505 |
New Jersey/ Delaware [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 545,241 |  | 545,241 |  | 545,657
Total revenue | 20,287 | 19,832 | 40,889 | 39,811 |
Property operating expenses, real estate taxes and third party management expenses | 8,932 | 9,516 | 18,668 | 20,603 |
Net operating income | 11,355 | 10,316 | 22,221 | 19,208 |
Richmond, Virginia [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 307,932 |  | 307,932 |  | 307,698
Total revenue | 8,902 | 9,278 | 17,937 | 18,076 |
Property operating expenses, real estate taxes and third party management expenses | 3,471 | 3,614 | 7,113 | 7,003 |
Net operating income | 5,431 | 5,664 | 10,824 | 11,073 |
Austin, Texas [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 258,924 |  | 258,924 |  | 257,694
Total revenue | 8,188 | 7,637 | 15,681 | 15,749 |
Property operating expenses, real estate taxes and third party management expenses | 3,612 | 3,412 | 7,009 | 6,506 |
Net operating income | 4,576 | 4,225 | 8,672 | 9,243 |
California [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 221,102 |  | 221,102 |  | 254,287
Total revenue | 4,831 | 4,781 | 9,800 | 9,584 |
Property operating expenses, real estate taxes and third party management expenses | 2,488 | 2,563 | 4,858 | 5,004 |
Net operating income | 2,343 | 2,218 | 4,942 | 4,580 |
Corporate [Member] |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |
Operating properties | 0 |  | 0 |  | 0
Construction-in-progress | 57,420 |  | 57,420 |  | 25,083
Land inventory | 109,564 |  | 109,564 |  | 109,008
Total revenue | (444) | (320) | (823) | (553) |
Property operating expenses, real estate taxes and third party management expenses | (329) | (212) | (768) | (545) |
Net operating income | $ (115) | $ (108) | $ (55) | $ (8) |

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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 The current amount of expenditures for a real estate project that has not yet been completed. + 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 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -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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