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Benefit Plans And Obligations For Termination Indemnity (Fair Value Of The Asset Values By Category) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset $ 81,780 $ 69,493 $ 62,790
Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 126    
Money Market Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 5,660 [1]    
U.S. Treasuries [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 9,075    
Corporate Bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 1,160    
Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 19,299 [2]    
U.S. Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 14,363 [3]    
International Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 2,916 [4]    
Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 27,015 [5]    
Real Estate [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 2,166 [3]    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 70,292    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 126    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | U.S. Treasuries [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 3,841    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Corporate Bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 1,160    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 19,299 [2]    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | U.S. Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 14,363 [3]    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | International Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 2,916 [4]    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 27,015 [5]    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Real Estate [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 1,572 [3]    
Significant Observable Inputs (Level 2) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 11,488    
Significant Observable Inputs (Level 2) [Member] | Money Market Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 5,660 [1]    
Significant Observable Inputs (Level 2) [Member] | U.S. Treasuries [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 5,234    
Significant Observable Inputs (Level 2) [Member] | Real Estate [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset 594 [3]    
Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset       
Significant Unobservable Inputs (Level 3) [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset       
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset    [1]    
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasuries [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset       
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset       
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset    [2]    
Significant Unobservable Inputs (Level 3) [Member] | U.S. Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset    [3]    
Significant Unobservable Inputs (Level 3) [Member] | International Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset    [4]    
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset    [5]    
Significant Unobservable Inputs (Level 3) [Member] | Real Estate [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of the asset    [3]    
[1] This category includes highly liquid daily traded cash-like vehicles.
[2] This category invests in highly liquid diverse mutual funds representing a diverse offering of debt issuance.
[3] This category represents common stocks that are traded on major exchanges.
[4] This change represents common stocks of companies domiciled outside of the U.S.; they can be represented by ordinary shares or ADRs.
[5] This category represents highly liquid diverse equity mutual funds of varying asset classes and styles.