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Employee Benefit Plans (Components of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 1,049 $ 924 $ 3,147 $ 2,770
Interest cost on projected benefit obligation 551 635 1,653 1,905
Expected return on plan assets (1,306) (1,284) (3,919) (3,852)
Amortization of unrecognized prior service credit (1) (8) (2) (26)
Amortization of unrecognized net actuarial loss 186 321 557 967
Net periodic benefit expense $ 479 $ 588 $ 1,436 $ 1,764