Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 497	$ 281
Interest cost	1,532	1,063
Expected return on assets	(1,358)	(971)
Amortization of prior service cost/(income)	(7)	(8)
Amortization of net actuarial loss	187	139
Net periodic benefit cost/(credit)	851	504
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	12	15
Interest cost	354	468
Expected return on assets	0	0
Amortization of prior service cost/(income)	(31)	(1,023)
Amortization of net actuarial loss	(9)	207
Net periodic benefit cost/(credit)	$ 326	$ (333)