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Employee Benefit Plans (Components of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]    
Service cost $ 923 $ 836
Interest cost on projected benefit obligation 635 598
Expected return on plan assets (1,284) (1,321)
Amortization of unrecognized prior service credit (9) (18)
Amortization of unrecognized net actuarial loss 323 188
Net periodic benefit expense $ 588 $ 283