Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps (Details)

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Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Average Notional Amount $ 55,307,546 $ 39,914,904 $ 46,500,488 $ 32,030,322
Interest Rate Swap [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Expense on Interest Rate Swap and Swaption Agreements (26,784) (15,079) (59,511) (48,490)
Derivative, Average Notional Amount $ 28,607,951 $ 19,884,272 $ 23,778,725 $ 17,486,421