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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Average Notional Amount $ 43,273,172 $ 32,776,778 $ 42,023,975 $ 28,266,287
Interest Rate Swap [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Expense on Interest Rate Swap and Swaption Agreements (18,891) (19,395) (32,727) (33,411)
Derivative, Average Notional Amount $ 23,467,489 $ 17,655,220 $ 21,324,091 $ 16,267,624