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Debt (Grouping Of Debt Between Fixed And Variable As Well As Secured And Unsecured) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Debt Instrument [Line Items]  
Debt, net$ 2,605,737[1]$ 2,589,448[1]
As To Interest Rate [Member]
  
Debt Instrument [Line Items]  
Fixed-rate debt2,059,0102,349,802
Variable-rate debt546,727239,646
Debt, net2,605,7372,589,448
As To Collateralization [Member]
  
Debt Instrument [Line Items]  
Debt, net2,605,7372,589,448
Unsecured debt1,540,8821,450,148
Secured debt$ 1,064,855$ 1,139,300
[1]Consolidated Variable Interest Entities' Assets and Liabilities included in the above balances (See Note 3):