Pension Plans And Other Postretirement Benefits (Schedule Of Estimated Amounts To Be Amortized From Accumulated Other Comprehensive Loss Into Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	$ (953)	$ (986)	$ (984)
Actuarial loss	49,729	40,289
Domestic Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(1,009)	(1,038)	(1,039)
Actuarial loss	48,977	40,124
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(697)	(1,704)	(7,572)
Actuarial loss	3,555	552
Scenario, Forecast [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(1,027)
Actuarial loss	36,635
Scenario, Forecast [Member] | Domestic Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(1,084)
Actuarial loss	35,228
Scenario, Forecast [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(95)
Actuarial loss	$ 2,576