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Benefit Plans And Obligations For Termination Indemnity (Funded Status And Amounts Recognized In The Consolidated Financial Statements) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 119,983 $ 103,134  
Service cost 8,058 7,031 6,694
Interest cost 6,362 5,858 5,427
Exchange rate differences (508) (1,023)  
Actuarial (gain) loss 21,459 7,374  
Benefits paid (2,257) (2,391)  
Benefit obligation at end of year 153,097 119,983 103,134
Fair value of Plans assets at beginning of year 69,493 62,790  
Actual return on Plan assets (net of expenses) (785) 6,326  
Employer contribution 15,266 2,679  
Fair value of Plans assets at end of year 81,780 69,493 62,790
Funded status (71,317) (50,490)  
Unrecognized net actuarial loss 60,650 34,972  
Unrecognized prior service cost 584 680  
Accrued benefit cost, end of period (10,083) (14,838)  
Accrued benefit liability, current (85) (39)  
Accrued benefit liability, non-current (71,232) (50,451)  
Accumulated other comprehensive income (loss), pre-tax 61,234 35,652  
Net amount recognized (10,083) (14,838)  
Retiree Medical Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 2,914 2,419  
Service cost 252 208  
Interest cost 152 138  
Actuarial (gain) loss (63) 216  
Employee contribution 19 21  
Benefits paid (129) (88)  
Benefit obligation at end of year 3,145 2,914  
Employer contribution 110 67  
Funded status (3,145) (2,914)  
Unrecognized net actuarial loss 455 540  
Unrecognized prior service cost   74  
Accrued benefit cost, end of period (2,690) (2,300)  
Accrued benefit liability, current (111) (122)  
Accrued benefit liability, non-current (3,034) (2,792)  
Accumulated other comprehensive income (loss), pre-tax 455 614  
Net amount recognized $ (2,690) $ (2,300)