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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9,709 $ 8,205 $ 7,031
Interest cost 6,567 6,361 5,858
Expected return on Plans' assets (6,400) (5,512) (4,914)
Amortization of prior service cost 172 104 95
Amortization of transition amount (131) (147) (130)
Amortization of net actuarial loss 4,107 1,988 1,769
Total net periodic benefit cost 14,023 10,999 9,709
Accumulated benefit obligation 167,667 144,682 112,643
Retiree Medical Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 299 253  
Interest cost 117 151  
Amortization of prior service cost 12 74  
Amortization of net actuarial loss   22  
Total net periodic benefit cost $ 428 $ 500