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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
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Interest Expense on Interest Rate Swap and Swaption Agreements $ (14,015) $ (4,716)
Termination of Interest Rate Swaps and Swaptions, Number of Positions 69 11
Termination of Interest Rate Swaps and Swaptions, Notional Amount 8,160,000 925,000
Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement (17,165) (475)
Loss on Termination of Interest Rate Swaps and Swaptions (58,692) (11,265)
Termination of Credit Default Swaps, Number of Positions   4
Termination of Credit Default Swaps, Notional Amount   85,000
Termination of Credit Default Swaps, Interest Spread Settlement   10
Loss on Termination of Credit Default Swaps   (1,618)
Interest Rate Swap [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liability, Average Notional Amount $ 14,854,500 $ 6,366,593