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Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Effects Of One-Percentage Point Change In Assumed Health Care Cost Trend Rates On Its Postretirement Benefits) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Employee Benefit Plans And Other Postretirement Benefits [Abstract]  
Effect on postretirement benefit obligation, 1-Percentage Point Increase $ 662
Effect on postretirement benefit obligation, 1-Percentage Point Decrease (587)
Effect on net postretirement benefit cost, 1-Percentage Point Increase 65
Effect on net postretirement benefit cost, 1-Percentage Point Decrease $ (56)