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

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.

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