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Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 986 $ 565
Interest cost 3,043 2,141
Expected return on assets (2,698) (1,955)
Amortization of prior service cost/(income) (14) (16)
Amortization of net actuarial loss 372 279
Net periodic benefit cost/(credit) 1,689 1,014
Other postretirement benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 23 30
Interest cost 709 937
Expected return on assets 0 0
Amortization of prior service cost/(income) (62) (2,045)
Amortization of net actuarial loss (18) 414
Net periodic benefit cost/(credit) $ 652 $ (664)