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Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Sep. 30, 2012
Derivative Instruments and Hedges, Assets [Abstract]      
Ineffective portion of the change in fair value of the derivatives $ 0 $ 0  
Fair value of derivatives in a net liability position     $ 1,900,000