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Employee Benefit Plans (Net Periodic Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Defined Benefit Plan, Non-Service Cost $ 400 $ 1,300  
Service cost 717 1,010 $ 675
Interest cost on projected benefit obligation 2,555 3,130 2,806
Expected return on plan assets (5,021) (4,725) (5,418)
Amortization of loss 2,821 2,881 2,689
Net periodic pension cost $ 1,072 $ 2,296 $ 752