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Benefit Plans And Obligations For Termination Indemnity (Effect Of A 1% Change In The Health Care Cost Trend Rate) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Benefit Plans And Obligations For Termination Indemnity [Abstract]  
Net periodic benefit cost, 1% increase $ 48
Net periodic benefit cost, 1% decrease (42)
Benefit obligation, 1% increase 281
Benefit obligation, 1% decrease $ (250)