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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. 15, 2011
Nov. 15, 2011
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Nov. 15, 2011
2007 Stock Option Plan [Member]
Jan. 31, 2007
2007 Stock Option Plan [Member]
Dec. 31, 2011
2007 Stock Option Plan [Member]
Dec. 31, 2011
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, 2011
Stock Appreciation Rights (SARs) [Member]
Y
Number of ordinary shares purchased by employees     226,965 223,020 619,451                
Options vested period from the date of grant, years             6 5          
Options exercisable     1,292,806 963,289 586,626           1,250,000 1,250,000 20,250
Options expiration date   2013                      
Options available for future grant under the Plan                 63,126        
Aggregate intrinsic value of outstanding options     $ 5,605 $ 24,811                  
Total intrinsic value of options exercised     1,934                    
Total unrecognized compensation cost related to share-based compensation arrangements granted                   1,292      
Expected cost recognized     2                    
Options vested and expected to be vested     1,450,005                    
Options vested and expected to be vested, weighted average exercise price     $ 37.07                    
Weighted average remaining contractual life of exercisable options     1                    
Aggregate intrinsic value of exercisable options     5,616                    
Compensation expense 980                        
Compensation expense     1,996 5,211 5,134                
Stock repurchase program, number of shares authorized to be repurchased           1,000,000              
Stock repurchased during period, shares     240,368                    
Treasury stock, value, acquired     10,000                    
Additional stock repurchased shares     196,532                    
Additional stock repurchased value     $ 7,700                    
SAR's exercisable terms     25% of any SAR's granted are exercisable on the first anniversary from the grant date and an additional 25% on each of the three subsequent anniversaries                    
Maximum term of SAR from the grant date, years                         5