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Benefit Plans And Obligations For Termination Indemnity (Fair Value Of The Asset Values By Category) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | $ 101,794 |  | $ 81,780 | $ 69,493
Cash [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 38 |  |  |
Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 4,153 | [1] |  |
Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 36,618 | [2] |  |
International Companies [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 1,554 | [3] |  |
Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 47,091 | [4] |  |
Other Asset [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 12,340 |  |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 101,794 |  |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 38 |  |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 4,153 | [1] |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 36,618 | [2] |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | International Companies [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 1,554 | [3] |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 47,091 | [4] |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other Asset [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset | 12,340 |  |  |
Significant Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  |  |  |
Significant Observable Inputs (Level 2) [Member] | Cash [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  |  |  |
Significant Observable Inputs (Level 2) [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [1] |  |
Significant Observable Inputs (Level 2) [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [2] |  |
Significant Observable Inputs (Level 2) [Member] | International Companies [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [3] |  |
Significant Observable Inputs (Level 2) [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [4] |  |
Significant Observable Inputs (Level 2) [Member] | Other Asset [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  |  |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Cash [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [1] |  |
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [2] |  |
Significant Unobservable Inputs (Level 3) [Member] | International Companies [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [3] |  |
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  | [4] |  |
Significant Unobservable Inputs (Level 3) [Member] | Other Asset [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of the asset |  |  |  |
[1] | This category includes highly liquid daily traded cash-like vehicles.
[2] | This category invests in highly liquid diverse mutual funds representing a diverse offering of debt issuance.
[3] | This change represents common stocks of companies domiciled outside of the U.S.; they can be represented by ordinary shares or ADRs.
[4] | This category represents highly liquid diverse equity mutual funds of varying asset classes and styles.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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