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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, 2013
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Expense on Interest Rate Swap and Swaption Agreements $ (15,079) $ (48,490)  
Termination of Interest Rate Swaps and Swaptions, Number of Positions 35 107  
Termination of Interest Rate Swaps and Swaptions, Notional Amount 8,058,000 16,518,000  
Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement (10,256) (27,421)  
Loss on Termination of Interest Rate Swaps and Swaptions 40,770 (21,904) (26,084)
Termination of Credit Default Swaps, Number of Positions 8 13  
Termination of Credit Default Swaps, Notional Amount 870,000 985,000  
Termination of Credit Default Swaps, Interest Spread Settlement   (504)  
Loss on Termination of Credit Default Swaps (9,937) (22,290)  
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Average Notional Amount 19,884,272 17,486,421  
Derivative Liability, Average Notional Amount $ 0 $ 0