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Pension Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Retirement Benefits [Abstract]        
Net periodic pension cost (income) $ (93) $ (241) $ 272 $ (403)