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Interest Rate Contracts (Interest Rate Derivatives Designated As Hedging Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Instruments
Interest Rate Swaps
 
Derivative [Line Items]  
Number of Instruments 7
Notional (in thousands) $ 1,828,080
Interest Rate Caps
 
Derivative [Line Items]  
Number of Instruments 2
Notional (in thousands) $ 111,920