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Retirement And Other Postretirement Benefit Plans (Net Periodic Postretirement Benefit Cost) (Details) (Other Postretirement Benefit Plans [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other Postretirement Benefit Plans [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 12 $ 14
Amortization of unrecognized loss 3 1
Net periodic pension benefit cost $ 15 $ 15