Benefit Plans (Schedule Of Amounts Recognized In Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Benefit Plans [Abstract]
Accrued liabilities	$ (2,779)	$ (2,910)
Postretirement benefits other than pensions	(14,462)	(13,431)
Other liabilities	(82,199)	(79,005)
Total pension and other postretirement accrued benefit liability	$ (99,440)	$ (95,346)