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Customer Advances In Excess Of Costs Incurred On Contracts In Progress (Tables)
 12 Months Ended
Dec. 31, 2011
Customer Advances In Excess Of Costs Incurred On Contracts In Progress [Abstract]  
Schedule Of Customer Advances
   
December 31,
  
   
2011
    
2010
  
Advances received
   $ 750,161     $ 637,070  
Less -
                
  Advances presented under long-term liabilities
     154,696       177,191  
  Advances deducted from inventories
     150,195       101,231  
      445,270       358,648  
Less -
                
  Costs incurred on contracts in progress (See Note 5)
     38,048       55,957  
    $ 407,222     $ 302,691