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Tax Credit Transactions (DetailsTextuals) (USD $)
 6 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Jun. 30, 2010
USB [Member]
Historic Tax Credit Transaction [Member]
Dec. 31, 2009
USB [Member]
Historic Tax Credit Transaction [Member]
Nov. 30, 2008
USB [Member]
Historic Tax Credit Transaction [Member]
Jun. 30, 2011
USB [Member]
Historic Tax Credit Transaction [Member]
Dec. 31, 2010
USB [Member]
Historic Tax Credit Transaction [Member]
Jun. 30, 2011
USB [Member]
New Markets Tax Credit Transaction [Member]
Dec. 31, 2010
USB [Member]
New Markets Tax Credit Transaction [Member]
Jun. 30, 2011
Historic Tax Credit Transaction [Member]
Jun. 30, 2010
Historic Tax Credit Transaction [Member]
Jun. 30, 2011
Historic Tax Credit Transaction [Member]
Jun. 30, 2010
Historic Tax Credit Transaction [Member]
Dec. 31, 2010
Historic Tax Credit Transaction [Member]
Nov. 17, 2008
Historic Tax Credit Transaction [Member]
sqft
Jun. 30, 2011
New Markets Tax Credit Transaction [Member]
Dec. 31, 2010
New Markets Tax Credit Transaction [Member]
Tax Credit Transactions (Textuals) [Abstract]                                    
Area of IRS Philadelphia Campus building (in square foot)                               862,692    
Percentage of building leased to IRS                               100.00%    
Agreed contribution in project cost by USB           $ 64,800,000                        
Amount received in advance for project cost   27,396,000   27,400,000 23,800,000 10,200,000                        
Amount to be received for project cost             3,000,000                      
Tax credit conditions                         20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus       100% recapture for a period of seven years as provided in the Internal Revenue Code  
USB contributions presented within deferred income             61,400,000 61,400,000 13,300,000 13,300,000                
Contribution allocated in non controlling interest                     2,200,000   2,200,000   2,100,000      
Limit on tax credit claims under the Community Renewal Tax Relief up to 39% of qualified investments in qualified, active low-income businesses or ventures                                  
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period                         Over the five year tax credit recapture period as defined in the Internal Revenue Code          
Deferred transaction costs 113,498,000   106,117,000               4,300,000   4,300,000   4,300,000   5,300,000 5,300,000
Rate of return on noncontrolling interest expected                         0.02          
Accretion of non controlling interest liability                     300,000 300,000 700,000 400,000        
Expected benefit from qualified program                                 $ 7,800,000