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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Financial Instruments [Abstract]  
Carrying Value, Fair Value And Hierarchy Of Financial Instruments
         
Fair Value Measure
 
   
Carrying Value
   
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Significant Other Observable Inputs (Level 2)
   
Significant Unobservable Inputs (Level 3)
 
Mutual fund investments of deferred
     compensation plans held in trust
  $ 35,055     $ 35,055     $ -     $ -  
Long-term debt
    168,759       191,370       -       -