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Benefit Plans And Obligations For Termination Indemnity (Plans' Funded Status And Amounts Recognized In The Consolidated Financial Statements) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 153,097 $ 119,983  
Service cost 9,709 8,205 7,031
Interest cost 6,567 6,361 5,858
Exchange rate differences 299 (508)  
Actuarial (gain) losses 10,747 21,313  
Benefits paid (3,329) (2,257)  
Benefit obligation at end of year 177,090 153,097 119,983
Fair value of Plans assets at beginning of year 81,780 69,493  
Actual return on Plans' assets (net of expenses) 11,002 (722)  
Employer contribution 12,341 15,266  
Fair value of Plans' assets at end of year 101,794 81,780 69,493
Funded status (75,296) (71,317)  
Unrecognized net actuarial loss 63,178 60,650  
Unrecognized prior service cost 498 584  
Net accrued benefit cost (11,620) (10,083)  
Accrued benefit liability, current (85) (85)  
Accrued benefit liability, non-current (75,211) (71,232)  
Accumulated other comprehensive income (loss), pre-tax 63,676 61,234  
Net amount recognized (11,620) (10,083)  
Retiree Medical Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 3,145 2,914  
Service cost 299 253  
Interest cost 117 151  
Actuarial (gain) losses (688) (63)  
Employee contribution 17 19  
Benefits paid (107) (129)  
Benefit obligation at end of year 2,781 3,145  
Fair value of Plans assets at beginning of year        
Employer contribution 90 110  
Fair value of Plans' assets at end of year        
Funded status (2,781) (3,145)  
Unrecognized net actuarial loss 246 455  
Unrecognized prior service cost        
Net accrued benefit cost (2,535) (2,690)  
Accrued benefit liability, current (175) (111)  
Accrued benefit liability, non-current (2,606) (3,034)  
Accumulated other comprehensive income (loss), pre-tax 246 455  
Net amount recognized $ (2,535) $ (2,690)