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Trade And Unbilled Receivables, Net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables $ 454,641 [1] $ 456,479 [1]
Unbilled receivables 242,616 219,906
Less - allowance for doubtful accounts (9,128) (6,861)
Trade and unbilled receivables, net 688,129 669,524
Includes receivables due from affiliated companies 20,623 20,030
Israeli Ministry Of Defense [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Short and long-term trade and unbilled receivables $ 417,536 $ 404,104
[1] Includes receivables due from affiliated companies