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Segment Information Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Operating properties $ 4,631,910   $ 4,631,910   $ 4,726,169
Real Estate Investments At Cost [Abstract]          
Construction-in-progress 52,702   52,702   48,950
Land inventory 94,097   94,097   102,439
Total revenue 143,456 134,520 424,198 400,113  
Property operating expenses (56,168) (53,567) (166,333) (157,203)  
Gross Profit 87,288 80,953 257,865 242,910  
Pennsylvania [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 1,196,987   1,196,987   1,178,730
Real Estate Investments At Cost [Abstract]          
Total revenue 39,268 38,373 114,730 113,110  
Property operating expenses (13,291) (13,463) (40,256) (39,285)  
Gross Profit 25,977 24,910 74,474 73,825  
Philadelphia CBD [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 1,026,116   1,026,116   988,590
Real Estate Investments At Cost [Abstract]          
Total revenue 35,891 33,026 107,957 98,086  
Property operating expenses (13,704) (12,432) (40,826) (37,080)  
Gross Profit 22,187 20,594 67,131 61,006  
Metropolitan Dc [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 1,207,243   1,207,243   1,193,200
Real Estate Investments At Cost [Abstract]          
Total revenue 29,320 26,516 85,889 79,919  
Property operating expenses (10,321) (10,638) (31,856) (31,156)  
Gross Profit 18,999 15,878 54,033 48,763  
New Jersey/ Delaware [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 410,143   410,143   546,644
Real Estate Investments At Cost [Abstract]          
Total revenue 16,171 15,536 47,449 46,550  
Property operating expenses (8,647) (7,930) (23,301) (22,841)  
Gross Profit 7,524 7,606 24,148 23,709  
Richmond, Virginia [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 309,646   309,646   309,923
Real Estate Investments At Cost [Abstract]          
Total revenue 8,640 8,826 26,359 26,762  
Property operating expenses (3,735) (3,761) (11,017) (10,874)  
Gross Profit 4,905 5,065 15,342 15,888  
Austin, Texas [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 289,075   289,075   285,346
Real Estate Investments At Cost [Abstract]          
Total revenue 9,937 8,274 29,067 23,957  
Property operating expenses (3,958) (3,485) (12,123) (10,494)  
Gross Profit 5,979 4,789 16,944 13,463  
CALIFORNIA
          
Segment Reporting Information [Line Items]          
Operating properties 192,700   192,700   223,736
Real Estate Investments At Cost [Abstract]          
Total revenue 4,632 4,448 13,773 13,034  
Property operating expenses (2,531) (2,362) (7,029) (6,747)  
Gross Profit 2,101 2,086 6,744 6,287  
Corporate [Member]
          
Segment Reporting Information [Line Items]          
Operating properties 0   0   0
Real Estate Investments At Cost [Abstract]          
Construction-in-progress 52,702   52,702   48,950
Land inventory 94,097   94,097   102,439
Total revenue (403) (479) (1,026) (1,305)  
Property operating expenses 19 504 75 1,274  
Gross Profit $ (384) $ 25 $ (951) $ (31)