Pensions and Other Postretirement Benefit Plans (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 552	$ 986
Interest cost	2,947	3,043
Expected return on assets	(2,250)	(2,698)
Curtailment cost/(income)	(3,770)	0
Settlement cost/(income)	2,170	0
Amortization of prior service cost/(income)	(13)	(14)
Amortization of net actuarial loss	609	372
Net periodic benefit cost/(credit)	245	1,689
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	20	23
Interest cost	707	709
Expected return on assets	0	0
Curtailment cost/(income)	0	0
Settlement cost/(income)	0	0
Amortization of prior service cost/(income)	(61)	(62)
Amortization of net actuarial loss	(16)	(18)
Net periodic benefit cost/(credit)	$ 650	$ 652