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Employee Benefit Plans (Net Periodic Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Service cost $ 675 $ 603 $ 452
Interest cost on projected benefit obligation 2,806 2,773 2,878
Expected return on plan assets (5,418) (5,300) (5,189)
Amortization of loss 2,689 2,835 2,780
Net periodic pension cost $ 752 $ 911 $ 921