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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements 
Fair Value Of Assets And Liabilities Measured On A Recurring Basis
   September 30, December 31,
   2011 2010
Assets:      
 Supplemental executive retirement savings plan investments  $ 5,968 $ 6,450
        
Liabilities:      
 Interest rate swap agreement  $ - $ 902