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Investments In Affiliated Companies, Partnership And Other Companies (Schedule Of Equity In Net Earnings Of Affiliated Companies) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]      
Equity in net earnings of affiliated companies and partnership $ 15,377 $ 18,796 $ 19,292
SCD [Member]
      
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]      
Equity in net earnings of affiliated companies and partnership 5,807 11,470 12,603
VSI [Member]
      
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]      
Equity in net earnings of affiliated companies and partnership 8,454 6,265 4,942
Other [Member]
      
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]      
Equity in net earnings of affiliated companies and partnership $ 1,116 $ 1,061 $ 1,747