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Pension Plan (Details) - Components of net periodic pension cost - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Plan (Details) - Components of net periodic pension cost [Line Items]    
Interest cost $ 455 $ 466
Expected return on plan assets (787) (716)
Amortization of net actuarial loss 229 219
Net periodic pension cost (benefit) $ (103) $ (31)