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Post-Retirement Benefit Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Defined contribution plan, increase (decrease) in cost recognized $ (69) $ 123 $ 348
Curtailment gain $ 148 $ 717