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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (One Percent Point Change in Health Care Cost Trend Rate Effect) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Effect on total service and interest cost components, 1% increase $ 70
Effect on total service and interest cost components, 1% decrease (63)
Effect on OPEB obligations, 1% increase 725
Effect on OPEB obligations, 1% decrease $ (665)