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Shareholders' Equity (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Nov. 13, 2012
Nov. 15, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Nov. 15, 2011
2007 Stock Option Plan [Member]
Jan. 31, 2007
2007 Stock Option Plan [Member]
Dec. 31, 2012
2007 Stock Option Plan [Member]
Dec. 31, 2012
Elbit Systems' Stock Options Plans [Member]
Jan. 31, 2007
Elbit Systems' Stock Options Plans [Member]
Jan. 31, 2007
Regular Options [Member]
2007 Stock Option Plan [Member]
Jan. 31, 2007
Cashless Options [Member]
2007 Stock Option Plan [Member]
Dec. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2012
Phantom Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Options vested period from the date of grant, years             6 years 5 years              
Options exercisable     1,271,266 1,292,806 963,289           1,250,000 1,250,000 1,250,000    
Period measuring the average closing price, in days     30 days                        
Percent vested and exercisable from the second anniversary of the commencement date     50.00%                        
Additional percentage vested and exercisable from the third anniversary of the commencement date     25.00%                        
Remaining percentage vested and exercisable from the third anniversary of the commencement date     25.00%                        
Options expiration date   2013                          
Options available for future grant under the Plan                 58,626            
Aggregate intrinsic value of outstanding options     $ 4,294 $ 5,605                      
Total intrinsic value of options exercised     480                        
Total unrecognized compensation cost related to share-based compensation arrangements granted                   982          
Expected cost recognition period, in years     2 years                        
Options vested and expected to be vested     1,384,852                        
Options vested and expected to be vested, weighted average exercise price     $ 36.95                        
Weighted average remaining contractual life of exercisable options, in years     1 year                        
Aggregate intrinsic value of exercisable options     4,299                        
Compensation expense 2,400 980                         312
Compensation expense recognized in income statement     3,326 1,996 5,211                    
Stock repurchase program, number of shares authorized to be repurchased           1,000,000                  
Stock repurchased during period, shares     759,632 240,368                      
Treasury stock, value, acquired     $ 26,006 $ 10,101                      
Percent of SARs granted that are exercisable on the first anniversary of the grant date     25.00%                        
Additional percentages of SARs that are exercisable on each of the three subsequent anniversaries after the first anniversary     25.00%                        
SARs outstanding number                           30,000  
SARs, number vested                           27,750  
SARs, weighted average exercise price per share                           $ 59.36  
Period from grant date each tranche has a benefit accumulation period, in years                             3 years
Period prior to grant date where basic price is determined, in days                             30 days
Percentage limited increase of benefit to be paid in the share price                             100.00%
Maximum term of SAR from the grant date, years                           5 years  
Granted, Number of options     30,000 63,300 28,000                    
Options allocated for Plan                             325,000
Available for grant, basic price                             $ 33.00