Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative Assets And Liabilities (Schedule Of Interest Rate Derivatives) (Details)

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Derivative Assets And Liabilities (Schedule Of Interest Rate Derivatives) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Derivative Assets And Liabilities [Abstract]      
Change in fair value of interest rate caps and floors $ 59,312 $ 27,720 $ (23,692)
Change in fair value of interest rate swaps acquired in Genesis Transaction (39,536) (22,947)  
Interest rate derivatives $ 19,776 $ 4,773 $ (23,692)