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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 |
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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 |

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