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Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Pension Plans' Assets Fair Value Measured On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | $ 185,122 | $ 167,033
Short-Term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 1,257 | 1,320
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 100,846 | 94,640
Level 1 [Member] | Short-Term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 84,276 | 72,393
Level 2 [Member] | Short-Term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 1,257 | 1,320
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Level 3 [Member] | Short-Term Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
U.S. Large Value [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 11,272 | 10,594
U.S. Large Value [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 11,272 | 10,594
U.S. Large Value [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
U.S. Large Growth [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 9,172 | 8,519
U.S. Large Growth [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 9,172 | 8,519
U.S. Large Growth [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
U.S. Mid-Cap Value [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 1,914 | 1,871
U.S. Mid-Cap Value [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 1,914 | 1,871
U.S. Mid-Cap Value [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
U.S. Mid-Cap Growth [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 3,684 | 3,486
U.S. Mid-Cap Growth [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 3,684 | 3,486
U.S. Mid-Cap Growth [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
U.S. Small Blend [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 3,784 | 3,394
U.S. Small Blend [Member] | Level 2 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 3,784 | 3,394
U.S. Small Blend [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Foreign Large Blend [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 27,164 | 26,616
Foreign Large Blend [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 27,164 | 26,616
Foreign Large Blend [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Diversified Emerging Markets [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 5,306 | 5,219
Diversified Emerging Markets [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 5,306 | 5,219
Diversified Emerging Markets [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Real Estate [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 5,405 | 5,095
Real Estate [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 5,405 | 5,095
Real Estate [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Government Bonds [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 24,372 | 21,088
Government Bonds [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 24,372 | 21,088
Government Bonds [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |
Corporate Bonds [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 91,792 | 79,831
Corporate Bonds [Member] | Level 1 [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 36,929 | 33,240
Corporate Bonds [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets | 54,863 | 46,591
Corporate Bonds [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total fair value of pension plans' assets |  |

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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 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 3: 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 4: 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 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=6962843&loc=d3e1928-114920 + Details
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