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Interest Rate Contracts (Interest Rate Derivatives Designated As Hedging Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Interest Rate Swaps [Member]
 
Derivative [Line Items]  
Number of Instruments 9
Notional $ 2,168,080
Interest Rate Caps [Member]
 
Derivative [Line Items]  
Number of Instruments 2
Notional $ 111,920