Pensions and Other Postretirement Benefit Plans (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 238	$ 371
Interest cost	1,527	1,450
Expected return on assets	(705)	(1,232)
Curtailment cost/(income)	0	(3,770)
Settlement cost/(income)	0	2,170
Amortization of prior service cost/(income)	(8)	(6)
Amortization of net actuarial loss	364	295
Net periodic benefit cost/(credit)	1,416	(722)
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10
Interest cost	332	353
Expected return on assets	0	0
Curtailment cost/(income)	0	0
Settlement cost/(income)	0	0
Amortization of prior service cost/(income)	(31)	(31)
Amortization of net actuarial loss	4	(8)
Net periodic benefit cost/(credit)	$ 314	$ 324