Pensions And Other Postretirement Benefits (Components Of Net Periodic Benefit (Credit) Cost) (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]
Service cost	$ 8,674	$ 7,702	$ 7,229
Interest cost	19,531	18,615	18,477
Expected return on plan assets	(34,125)	(34,565)	(35,273)
Amortization of transition amounts	4	4	6
Amortization of prior service cost	104	103	153
Recognized net actuarial losses (gains)	793	537	245
Curtailment loss	52	287	97
Termination benefits		926	6,411
Net periodic benefit (credit) cost	(4,967)	(6,391)	(2,655)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	785	763	719
Interest cost	1,501	1,730	1,836
Expected return on plan assets
Amortization of transition amounts
Amortization of prior service cost	710	840	1,001
Recognized net actuarial losses (gains)	(455)	(555)	(401)
Curtailment loss
Termination benefits			250
Net periodic benefit (credit) cost	$ 2,541	$ 2,778	$ 3,405