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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Retirement Benefits [Abstract]        
Service cost $ 871 $ 1,049 $ 1,742 $ 2,098
Interest cost on projected benefit obligation 647 551 1,294 1,102
Expected return on plan assets (1,141) (1,307) (2,282) (2,613)
Amortization of unrecognized prior service credit 0 (1) 0 (1)
Amortization of unrecognized net actuarial loss 64 186 128 371
Net periodic benefit expense $ 441 $ 478 $ 882 $ 957