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Pensions and Other Postretirement Benefits (Projected and Accumulated Benefit Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]    
Accumulated benefit obligation, all plans $ 23,040 $ 26,907
Plans for which the accumulated benefit obligation exceeds plan assets:    
Projected benefit obligation 22,552 27,317
Accumulated benefit obligation 22,155 26,074
Fair value of plan assets $ 13,256 $ 16,274