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Benefit Plans - Effects of One-Percentage Point Change in Assumed Health Care Costs Trend Rates (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
One Percentage Point Increase  
Effect on total service and interest cost components $ 736
Effect on the postretirement benefit obligation 4,518
One Percentage Point Decrease  
Effect on total service and interest cost components (560)
Effect on the postretirement benefit obligation $ (3,524)