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Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments And Hedging Activities [Abstract]      
(Gain)/loss recognized in OCI (effectiveness) $ 6,485 $ 29,567 $ 12,411
Loss reclassified from OCI into income $ 11,428 $ 13,949 $ 3,073