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Pension Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Retirement Benefits [Abstract]        
Net periodic pension cost (income) $ 202 $ 163 $ 605 $ 488