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Benefit Plans - Schedule of Effects of One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
One Percentage Point Increase  
Effect on total service and interest cost components $ 635
Effect on the postretirement benefit obligation 4,581
One Percentage Point Decrease  
Effect on total service and interest cost components (490)
Effect on the postretirement benefit obligation $ (3,597)