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Derivative Financial Instruments (Cash Collateral on Derivative Financial Instruments) (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Cash pledged as collateral $ 5,400,000 $ 6,700,000
Counterparties
   
Derivative [Line Items]    
Cash pledged as collateral $ 540,000 $ 0