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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 923 $ 802 $ 1,846 $ 1,604
Interest cost on projected benefit obligation 635 695 1,270 1,390
Expected return on plan assets (1,284) (1,184) (2,568) (2,368)
Amortization of unrecognized prior service credit (9) (17) (18) (33)
Amortization of unrecognized net actuarial loss 323 366 646 732
Net periodic benefit expense $ 588 $ 662 $ 1,176 $ 1,325