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Employee Benefit Plans (Schedule of Net Pension Costs) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Service cost - benefits earned during the period
Interest cost on projected benefit obligation 1,449 1,502 1,364
Expected return on plan assets (2,810) (2,698) (2,847)
Net amortization and deferral 244 238
Net periodic pension (income) cost $ (1,117) $ (958) $ (1,483)