Pensions And Other Postretirement Benefits (Summary Of Pension Plan Assets Measured At Fair Value On A Recurring Basis By Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	$ 357,967	$ 377,607
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	216,198	274,918
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	102,723	58,619
Pooled Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	19,765	19,338
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	11,562	10,725
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	7,719	14,007
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	258,553	298,143
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	216,198	274,918
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	34,636	9,218
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	7,719	14,007
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	87,852	68,739
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	68,087	49,401
Significant Observable Inputs (Level 2) [Member] | Pooled Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	19,765	19,338
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	11,562	10,725
Significant Unobservable Inputs (Level 3) [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	$ 11,562	$ 10,725	$ 9,878