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Derivative Financial Instruments (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Fair Value of Derivative Instruments  
Asset Derivatives $ 20,497
Liability Derivatives 20,497
Interest Rate Swaps [Member] | Other Assets [Member]
 
Fair Value of Derivative Instruments  
Asset Derivatives 20,497
Interest Rate Swaps [Member] | Other Liabilities [Member]
 
Fair Value of Derivative Instruments  
Liability Derivatives $ 20,497