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Employee Benefit Plans (Schedule of Net Pension Costs) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Service cost - benefits earned during the period
Interest cost on projected benefit obligation 1,312 1,449 1,502
Expected return on plan assets (1,115) (2,810) (2,698)
Net amortization and deferral 34 244 238
Net periodic pension (income) cost $ 231 $ (1,117) $ (958)