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Segment Reporting (Operating Activity Within Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Business_Segments
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Number of reportable business segments 2  
Rental revenue $ 126,423 $ 125,270
Rental expense (41,309) (40,947)
Rental revenue 19,035 18,118
Rental expense (5,009) (4,930)
Segment profit 99,140 97,511
Office Segment [Member]
    
Segment Reporting Information [Line Items]    
Rental revenue 126,423 125,270
Rental expense (41,309) (40,947)
Segment profit 85,114 84,323
Multifamily Segment [Member]
    
Segment Reporting Information [Line Items]    
Rental revenue 19,035 18,118
Rental expense (5,009) (4,930)
Segment profit $ 14,026 $ 13,188