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Long-Term Debt (Schedule Of Aggregate Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Long-Term Debt [Abstract]    
2012 $ 2,479 $ 3,449
2013 242,638  
2014 3,970  
2015 1,290,085  
2016 1,840,693  
Later 274,042  
Total $ 3,653,907 $ 3,915,551