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Other Current Assets (Tables)
 6 Months Ended
Jun. 30, 2011
Other Current Assets  
Other Current Assets
     June 30,
2011		      December 31,
2010		  

Deposits in trusts for employee benefits and retirement plans

    $ 85,872       $ 82,335   

Other

      53,718         59,126   
                 
   $ 139,590       $ 141,461