Employee Benefits (Schedule Of Amounts Recognized In The Consolidated Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ 0	$ 0
Noncurrent liabilities	(22,988)	(24,398)
Net amount recognized	(22,988)	(24,398)
Post-Retirement Healthcare Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(1,753)	(1,710)
Noncurrent liabilities	(19,630)	(18,502)
Net amount recognized	$ (21,383)	$ (20,212)