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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Expense on Interest Rate Swap and Swaption Agreements $ (19,395) $ (33,411)  
Termination of Interest Rate Swaps and Swaptions, Number of Positions 3 72  
Termination of Interest Rate Swaps and Swaptions, Notional Amount 300,000 8,460,000  
Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement   (17,165)  
Loss on Termination of Interest Rate Swaps and Swaptions (3,983) (62,675) (18,540)
Termination of Credit Default Swaps, Number of Positions   5  
Termination of Credit Default Swaps, Notional Amount   115,000  
Termination of Credit Default Swaps, Interest Spread Settlement   (2)  
Loss on Termination of Credit Default Swaps   (12,353)  
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Average Notional Amount 17,655,220 16,267,624  
Derivative Liability, Average Notional Amount $ 0 $ 0