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Significant Accounting Policies (Narrative) (Details)
 12 Months Ended 12 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
ILS
Dec. 31, 2012
ILS
May 31, 2012
USD ($)
May 31, 2012
ILS
Mar. 31, 2012
USD ($)
Mar. 31, 2012
ILS
Jun. 30, 2010
ILS
Dec. 31, 2013
UAV Tactical Systems Ltd
Dec. 31, 2013
Advance Flight Training Limited Partnership
Dec. 31, 2013
Series A
USD ($)
Dec. 31, 2012
Series A
ILS
Jun. 30, 2012
Series A
ILS
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
May 31, 2012
Cross Currency Interest Rate Swaps
London Interbank Offered Rate (LIBOR)
Dec. 31, 2013
Cross Currency Interest Rate Swaps
London Interbank Offered Rate (LIBOR)
Dec. 31, 2013
Cross Currency Interest Rate Swaps
London Interbank Offered Rate (LIBOR)
Senior Notes
Dec. 31, 2012
Cross Currency Interest Rate Swaps
London Interbank Offered Rate (LIBOR)
Senior Notes
Significant Accounting Policies [Line Items]                                          
Components of accumulated other comprehensive income loss, tax $ 12,604,000 $ 23,744,000                                      
Derivative Instruments, tax benefit 24,000                                        
Pension and Other Postretirement Benefit Plans, tax benefit 12,580,000                                        
Percentage of equity voting rights                               20.00% 50.00%        
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% 100.00%                  
Contractual rights percentage                       50.00%                  
Minimum term of maturity where deposits are considered long-term, in years 1 year                                        
Impairment of long-lived assets 900,000                                        
Severance expenses 54,544,000 58,326,000 50,018,000                                    
Cost of revenue sold, change in estimate (5,300,000) (36,000,000) (26,800,000)                                    
Percentage of cost of revenue sold 0.25% 1.74% 1.28%                                    
Percentage of gross profit 0.64% 4.41% 3.66%                                    
Cost of revenue sold, increase (decrease) to net income 4,600,000 32,500,000 23,200,000                                    
Cost of revenue sold, increase (cecrease) in earnings per share, diluted $ 0.11 $ 0.77 $ 0.54                                    
Percentage of revenue from service 10.00% 10.00% 10.00%                                    
Issuance amount of Series A Note 423,509,000 450,040,000       24,407,000 92,000,000 217,420,000 807,000,000 1,100,000,000         900,000,000            
Cross currency interest rate swap, amount 287,000,000     1,100,000,000 1,100,000,000                 900,000,000              
Received interest payments semi-annually in NIS 4.84% 4.84%       4.84% 4.84%     4.84%                      
Debt instrument, description of variable rate basis                                   LIBOR LIBOR LIBOR  
Derivative, basis spread on variable rate                                     1.65%   1.84%
Senior notes fair value                         457,136,000                
Rights sold to receive payments from the Israeli Ministry of Defense $ 161,693,000                                        
Outstanding anti-dilutive stock options excluded from the calculations of diluted net earnings per share 45,031 125,709 76,815