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Investments In Affiliated Companies, Partnership And Other Companies (Investments In Companies Accounted For Under The Equity Method) (Details)
€ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2016
EUR (€)
Jul. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 30, 2010
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 164,761,000 $ 173,396,000    
Impairment on affiliated company         0 2,500,000 $ 0  
Equity Method Investments, additional investment through convertible bonds         4,964,000 19,277,000 23,852,000  
Subsidiary A                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 65,799,000 65,594,000    
Equity method investment ownership percentage         50.00%      
Proceeds from Dividends Received         $ 9,374,000 2,140,000    
Rafael Advanced Defense Systems Ltd                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investment ownership percentage         50.00%      
Subsidiary B                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 21,708,000 19,974,000    
Equity method investment ownership percentage         50.00001%      
Ownership percentage in subsidiaries               49.00%
Payments to Acquire Additional Interest in Subsidiaries         $ 1,300,000      
Subsidiary Of Rafael                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investment ownership percentage         49.99999%      
Subsidiary C                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 0 11,881,000    
Ownership percentage in subsidiaries         40.00%      
Impairment on affiliated company         $ 2,500,000      
Consideration received in sale         12,000,000      
Subsidiary D                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 15,000,000 19,120,000 $ 20,000,000 [1]  
Ownership percentage in subsidiaries         33.00%      
Subsidiary E                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 18,003,000 18,003,000    
Ownership interest acquired by noncontrolling interest 20.00% 20.00%   3.00% 3.00%      
Ownership percentage in subsidiaries         77.00%      
Deconsolidation, Gain (Loss), Amount   $ 10,500,000            
Subsidiary F                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 27,927,000 25,707,000    
Payments to Acquire Interest in Joint Venture     $ 13,400,000          
Subsidiary G                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 5,114,000 5,107,000    
Ownership percentage in subsidiaries         71.00%      
Others                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Equity method investments         $ 11,210,000 $ 8,010,000    
Strategic Investor | Subsidiary E                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Payments to Acquire Additional Interest in Subsidiaries € 16,000 $ 18,000,000   € 2,500 $ 2,800,000      
Wholly-Owned U.K Subsidiary | Corporate Joint Venture | Subsidiary F                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Joint Venture, Ownership Percentage     50.00%          
Kellogg Brown & Root Limited | Corporate Joint Venture | Subsidiary F                
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]                
Joint Venture, Ownership Percentage     50.00%          
[1] Company D is a European company held 33% by the Company. During 2015, the Company, through a wholly-owned Israeli subsidiary, invested approximately $20,000 in Company D, which is engaged in the area of composite aerostructure parts manufacturing for commercial aircraft.