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Summary Of Significant Accounting Policies (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]    
Derivatives $ 8,827 $ 10,016
Retirement liability 17,727 17,727
Total $ 26,554 $ 27,743