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Employee Benefit Plans (Components of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 1,049 $ 923 $ 2,098 $ 1,846
Interest cost on projected benefit obligation 551 635 1,102 1,270
Expected return on plan assets (1,307) (1,284) (2,613) (2,568)
Amortization of unrecognized prior service credit (1) (9) (1) (18)
Amortization of unrecognized net actuarial loss 186 323 371 646
Net periodic benefit expense $ 478 $ 588 $ 957 $ 1,176