Employee Benefits (Schedule Of Amounts Recognized In The Consolidated Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (24,398)	$ (21,166)
Net amount recognized	(24,398)	(21,166)
Post-Retirement Healthcare Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(1,710)	(1,590)
Noncurrent liabilities	(18,502)	(18,457)
Net amount recognized	$ (20,212)	$ (20,047)