Income Taxes (Schedule Of Deferred Income Tax Assets And (Liabilities) Recorded On The Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Postretirement benefits other than pensions	$ 15,705	$ 15,332
Accrued employee benefits	37,861	22,682
Operating loss carryovers	72,570	84,185
Pensions	45,213	32,335
Tax credit carryovers	49,999	43,856
Other	16,097	24,330
Gross deferred tax assets	237,445	222,720
Valuation allowance	(36,419)	(39,802)
Deferred tax assets	201,026	182,918
Depreciation	(193,814)	(197,123)
Foreign currency translation adjustments	(6,979)	(13,077)
Other	(19,801)	(15,193)
Deferred tax liabilities	(220,594)	(225,393)
Net deferred tax liabilities	(19,568)	(42,475)
Current deferred tax assets	9,383	4,689
Current deferred tax liabilities	(2,005)	(2,223)
Noncurrent deferred tax assets	50,957	64,629
Noncurrent deferred tax liabilities	$ (77,903)	$ (109,570)