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Benefit Plans And Obligations For Termination Indemnity (Components Of The Plans Net Periodic Pension Cost) (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]      
Service cost $ 8,058 $ 7,031 $ 6,694
Interest cost 6,362 5,858 5,427
Expected return on Plans' assets (5,512) (4,914) (3,915)
Amortization of prior service cost 104 95 97
Amortization of transition amount (147) (130) (120)
Amortization of net actuarial loss 1,988 1,769 2,282
Total net periodic benefit cost 10,999 9,709 10,465
Accumulated benefit obligation 144,682 112,643 95,877
Retiree Medical Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 252 208  
Interest cost 152 138  
Amortization of prior service cost 74 150  
Amortization of net actuarial loss 21 7  
Total net periodic benefit cost $ 500 $ 503