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Retirement And Other Postretirement Benefit Plans (Net Periodic Benefit Cost For The Defined Benefit Plans) (Details) (Pension Plans, Defined Benefit [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 17 $ 7
Interest cost 1,541 1,699
Expected return on plan assets (1,934) (1,891)
Amortization, Unrecognized net transition asset (23) (23)
Amortization, Unrecognized prior service cost (credit) 2 2
Amortization, unrecognized loss 447 294
Net periodic pension benefit cost $ 50 $ 88