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Employee Benefit Plans (Details 9)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Effects of one-percentage-point change in the assumed health care cost trend rate  
Effect on total service and interest cost components in 2015, One Percentage Point Increase $ (3)
Effect on total service and interest cost components in 2015, One Percentage Point Decrease 3
Effect on postretirement benefit obligation as of December 31, 2015, One Percentage Point Increase (114)
Effect on postretirement benefit obligation as of December 31, 2015, One Percentage Point Decrease $ 98