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Benefit Plans And Obligations For Termination Indemnity (Tables) | 12 Months Ended
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Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |
Plans' Funded Status And Amounts Recognized |
|  | December 31, |
Changes in benefit obligation: |  | 2011 |  |  | 2010 |
Benefit obligation at beginning of year |  | $ | 119,983 |  |  | $ | 103,134 |
Service cost |  |  | 8,058 |  |  |  | 7,031 |
Interest cost |  |  | 6,362 |  |  |  | 5,858 |
Exchange rate differences |  |  | (508 | ) |  |  | (1,023 | )
Actuarial losses |  |  | 21,459 |  |  |  | 7,374 |
Benefits paid |  |  | (2,257 | ) |  |  | (2,391 | )
Benefit obligation at end of year |  | $ | 153,097 |  |  | $ | 119,983 |
Changes in the Plans 'Assets: |  |  |  |  |  |  |  |
Fair value of Plans' assets at beginning of year |  |  | 69,493 |  |  |  | 62,790 |
Actual return on Plans' assets (net of expenses) |  |  | (785 | ) |  |  | 6,326 |
Employer contribution |  |  | 15,266 |  |  |  | 2,679 |
Benefits paid |  |  | (2,194 | ) |  |  | (2,302 | )
Fair value of Plans' assets at end of year |  | $ | 81,780 |  |  | $ | 69,493 |
Accrued benefit cost, end of year: |  |  |  |  |  |  |  |
Funded status |  |  | (71,317 | ) |  |  | (50,490 | )
Unrecognized net actuarial loss |  |  | 60,650 |  |  |  | 34,972 |
Unrecognized prior service cost |  |  | 584 |  |  |  | 680 |
|  | $ | (10,083 | ) |  | $ | (14,838 | )
Amount recognized in the statement of financial position: |  |  |  |  |  |  |  |
Accrued benefit liability, current |  |  | (85 | ) |  |  | (39 | )
Accrued benefit liability, non-current |  |  | (71,232 | ) |  |  | (50,451 | )
Accumulated other comprehensive income, pre-tax |  |  | 61,234 |  |  |  | 35,652 |
Net amount recognized |  | $ | (10,083 | ) |  | $ | (14,838 | )
Components Of Net Periodic Pension Cost |
|  | Year ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Components of the Plans' net periodic pension cost: |  |  |  |  |  |  |  |  |
Service cost |  | $ | 8,205 |  |  | $ | 7,031 |  |  | $ | 6,694 |
Interest cost |  |  | 6,361 |  |  |  | 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 |
Additional information |  |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation |  | $ | 144,682 |  |  | $ | 112,643 |  |  | $ | 95,877 |
Schedule Of Assumptions Used |
|  | December 31, |
Weighted average assumptions: |  | 2011 |  |  | 2010 |
Discount rate as of December 31 |  |  | 4.4 | % |  |  | 5.4 | %
Expected long-term rate of return on Plans' assets |  |  | 7.3 | % |  |  | 7.3 | %
Rate of compensation increase |  |  | 2.4 | % |  |  | 2.7 | %
Asset Allocation By Category |
|  | 2011 |  |  | 2010 |
Asset Category |  |  |  |  |  |
Equity Securities |  |  | 56.8 | % |  |  | 58.1 | %
Debt Securities |  |  | 36.1 | % |  |  | 33.6 | %
Other |  |  | 7.1 | % |  |  | 8.3 | %
Total |  |  | 100.0 | % |  |  | 100.0 | %
Target Asset Allocation For The Plan |
|  | 2011 |  |  | 2010 |
Asset Category |  |  |  |  |  |
Equity Securities |  |  | 56.0 | % |  |  | 60.0 | %
Debt Securities |  |  | 41.2 | % |  |  | 37.0 | %
Other |  |  | 2.8 | % |  |  | 3.0 | %
Total |  |  | 100.0 | % |  |  | 100.0 | %
Retiree Medical Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Plans' Funded Status And Amounts Recognized |
|  | December 31 |  |  | December 31 |
|  | 2011 |  |  | 2010 |
Change in Benefit Obligation: |  |  |  |  |  |
Benefit obligation at beginning of period |  | $ | 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 period |  | $ | 3,145 |  |  | $ | 2,914 |
Change in Plan Assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  | $ | - |  |  | $ | - |
Employer contribution |  |  | 110 |  |  |  | 67 |
Employee contribution |  |  | 19 |  |  |  | 21 |
Benefits paid |  |  | (129 | ) |  |  | (88 | )
Fair value of plan assets at end of period |  | $ | - |  |  | $ | - |
|  | Year ended December 31, |
|  | 2011 |  |  | 2010 |
Accrued benefit cost, end of period: |  |  |  |  |  |
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 | )
Amounts recognized in the statement of financial position: |  |  |  |  |  |  |  |
Accrued benefit liability, current |  | $ | (111 | ) |  | $ | (122 | )
Accrued benefit liability, non-current |  |  | (3,034 | ) |  |  | (2,792 | )
Accumulated other comprehensive loss, pretax |  |  | 455 |  |  |  | 614 |
Net amount recognized |  | $ | (2,690 | ) |  | $ | (2,300 | )
Schedule Of Assumptions Used |
Assumptions as of end of period: |  |  |  |  |
Discount rate |  |  | 3.78 | % |  |  | 5.32 | %
Health care cost trend rate assumed for next year |  |  | 8.50 | % |  |  | 8.00 | %
Ultimate health care cost trend rate |  |  | 5.00 | % |  |  | 5.00 | %
Effect Of A 1% Change In The Health Care Cost Trend Rate |
|  | 1% increase |  |  | 1% decrease |
Net periodic benefit cost |  | $ | 48 |  |  | $ | (42 | )
Benefit obligation |  | $ | 281 |  |  | $ | (250 | )

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