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Commitments And Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2011
Commitments And Contingent Liabilities [Abstract]  
Future Minimum Lease Commitments
2012
  $ 36,521  
2013
    25,310  
2014
    19,496  
2015
    12,564  
2016
    7,480  
2017 and thereafter
    14,913  
    $ 116,284