Retirement Plans (Schedule Of Amounts Recognized In Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 132,990	$ 128,004
Prior service cost (credit)	888	1,509
Total recognized in other comprehensive loss before tax	133,878	129,513
Deferred tax asset	(2,137)	(811)
Total recognized in other comprehensive loss, net of tax	131,741	128,702
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	4,293	3,492
Prior service cost (credit)	(4,025)	(4,623)
Total recognized in other comprehensive loss before tax	268	(1,131)
Deferred tax asset	(516)
Total recognized in other comprehensive loss, net of tax	$ (248)	$ (1,131)