Annual report pursuant to Section 13 and 15(d)

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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Expense on Interest Rate Swap and Swaption Agreements $ (58,522) $ (38,448) $ (24,883)
Termination of Interest Rate Swaps and Swaptions, Number of Positions 155 26 32
Termination of Interest Rate Swaps and Swaptions, Notional Amount 33,798,000 4,450,000 3,200,000
Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement (34,521) (1,573) (5,952)
Loss on Termination of Interest Rate Swaps and Swaptions 12,293 (29,579) (16,970)
Termination of Credit Default Swaps, Number of Positions 22 18 3
Termination of Credit Default Swaps, Notional Amount 2,520,000 825,000 175,000
Termination of Credit Default Swaps, Interest Spread Settlement (1,882) (2,902) (1,131)
Loss on Termination of Credit Default Swaps (53,154) (17,570) 4,567
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Average Notional Amount 16,965,918 0  
Derivative Liability, Average Notional Amount $ 0 $ 9,891,749 $ 3,667,493