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Derivative Instruments and Hedging Activities Components of Other Income (Expense) Related to Interest Rate and Credit Default Swaps (Details)

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Derivative Instruments and Hedging Activities Components of Other Income (Expense) Related to Interest Rate and Credit Default Swaps (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Expense on Interest Rate Swap and Swaption Agreements $ (10,718) $ (23,089)  
Termination of Interest Rate Swaps and Swaptions, Number of Positions 3 22  
Termination of Interest Rate Swaps and Swaptions, Notional Amount 800,000 3,725,000  
Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement   (1,488)  
Gain on Termination of Interest Rate Swaps and Swaptions 7,545 (26,084) (18,074)
Termination of Credit Default Swaps, Number of Positions 3 13  
Termination of Credit Default Swaps, Notional Amount 185,000 425,000  
Termination of Credit Default Swaps, Interest Spread Settlement 94 31  
Loss on Termination of Credit Default Swaps 1,014 (2,301)  
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Liability, Average Notional Amount $ 11,327,391 $ 8,625,967