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Pensions And Other Postretirement Benefits (Schedule Of Reconciliation Of Level 3 Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at December 31	$ 357,967	$ 377,607
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at December 31	11,562	10,725
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at December 31	11,562	10,725
Significant Unobservable Inputs (Level 3) [Member] \| Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	10,725	9,878
Net realized and unrealized losses included in earnings	(325)	(406)
Net purchases, issuances and settlements	1,162	1,253
Fair value of plan assets at December 31	$ 11,562	$ 10,725

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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