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Segment Information Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | $ 4,620,460 |  | $ 4,620,460 |  | $ 4,726,169
Construction-in-progress | 51,260 |  | 51,260 |  | 48,950
Land inventory | 94,444 |  | 94,444 |  | 102,439
Total revenue | 140,919 | 131,803 | 280,742 | 265,593 |
Property operating expenses | (55,068) | (51,135) | (110,248) | (103,714) |
Gross Profit | 85,851 | 80,668 | 170,494 | 161,879 |
Pennsylvania [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 1,198,731 |  | 1,198,731 |  | 1,178,730
Total revenue | 37,276 | 36,784 | 75,461 | 74,736 |
Property operating expenses | (13,151) | (12,640) | (27,050) | (25,902) |
Gross Profit | 24,125 | 24,144 | 48,411 | 48,834 |
Philadelphia CBD [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 1,023,619 |  | 1,023,619 |  | 988,590
Total revenue | 36,142 | 31,911 | 72,067 | 65,062 |
Property operating expenses | (13,587) | (11,962) | (27,121) | (24,648) |
Gross Profit | 22,555 | 19,949 | 44,946 | 40,414 |
Metropolitan Dc [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 1,199,885 |  | 1,199,885 |  | 1,193,200
Total revenue | 28,783 | 26,967 | 56,567 | 53,403 |
Property operating expenses | (10,774) | (10,451) | (21,536) | (20,518) |
Gross Profit | 18,009 | 16,516 | 35,031 | 32,885 |
New Jersey/ Delaware [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 408,940 |  | 408,940 |  | 546,644
Total revenue | 15,676 | 15,284 | 31,278 | 31,013 |
Property operating expenses | (7,245) | (7,083) | (14,653) | (14,912) |
Gross Profit | 8,431 | 8,201 | 16,625 | 16,101 |
Richmond, Virginia [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 310,229 |  | 310,229 |  | 309,923
Total revenue | 8,954 | 8,903 | 17,719 | 17,937 |
Property operating expenses | (3,599) | (3,470) | (7,282) | (7,112) |
Gross Profit | 5,355 | 5,433 | 10,437 | 10,825 |
Austin, Texas [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 286,808 |  | 286,808 |  | 285,346
Total revenue | 9,871 | 8,188 | 19,129 | 15,682 |
Property operating expenses | (4,208) | (3,611) | (8,165) | (7,009) |
Gross Profit | 5,663 | 4,577 | 10,964 | 8,673 |
CALIFORNIA |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 192,248 |  | 192,248 |  | 223,736
Total revenue | 4,536 | 4,210 | 9,142 | 8,586 |
Property operating expenses | (2,339) | (2,249) | (4,498) | (4,384) |
Gross Profit | 2,197 | 1,961 | 4,644 | 4,202 |
Corporate [Member] |  |  |  |  |
Real Estate Investments At Cost [Abstract] |  |  |  |  |
Rental properties | 0 |  | 0 |  | 0
Construction-in-progress | 51,260 |  | 51,260 |  | 48,950
Land inventory | 94,444 |  | 94,444 |  | 102,439
Total revenue | (319) | (444) | (621) | (826) |
Property operating expenses | (165) | 331 | 57 | 771 |
Gross Profit | $ (484) | $ (113) | $ (564) | $ (55) |

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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 -Section 03 -Paragraph 2 -Article 5 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 Carrying amount of land available for development. + 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.(a),1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph d -Article 7 + Details
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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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- Definition The aggregate revenue from real estate operations during the reporting period. + 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(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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