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Significant Accounting Policies (Narrative) (Details)
 1 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2010
ILS
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
ILS
May 31, 2012
USD ($)
May 31, 2012
ILS
Mar. 31, 2012
USD ($)
Mar. 31, 2012
ILS
Dec. 31, 2012
UAV Tactical Systems Ltd [Member]
Dec. 31, 2012
Series A [Member]
USD ($)
Dec. 31, 2010
Series A [Member]
USD ($)
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Significant Accounting Policies [Line Items]                            
Components of accumulated other comprehensive income loss, tax   $ 23,845,000 $ 25,419,000                      
Percentage of equity voting rights   51.00%                     50.00% 20.00%
Amount in which the company discontinues applying the equity method for investments   0                        
Reduction of allocation to non-controlling interest   0                        
Voting rights                   51.00%        
Minimum term of maturity where deposits are considered long-term, in years   1 year                        
Severance expenses   58,326 50,018 50,228                    
Percentage of revenue from service   10.00% 10.00% 10.00%                    
Notes issued 1,100,000,000                          
Issuance amount of Series A Note           24,407,000 92,000,000 217,420,000 807,000,000   900,000,000 1,100,000,000    
Received interest payments semi-annually in NIS 4.84% 4.84%   4.84%                    
Cross currency interest rate swap, amount   287,000,000     1,100,000,000                  
Derivative, Basis Spread on Variable Rate   1.65%   1.84%                    
Variable rate basis of fair value hedge transactions   Under the cross currency interest rate swaps, the Company will receive fixed NIS at a rate of 4.84% on NIS 1.1 billion and pay floating six-month USD LIBOR + an average spread of 1.65% on $287,000, which reflects the U.S. dollar value of the Series A Notes on the specific dates the transactions were consumed.                        
Senior notes fair value                     $ 477,943,000      
Outstanding anti-dilutive stock options excluded from the calculations of diluted net earnings per share   125,709 76,815 23,041