Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Pension charges		$ 49,100
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 986	1,061
Interest cost	3,447	4,235
Expected return on assets	(3,063)	(5,099)
Amortization of prior service cost/(income)	(24)	(2)
Amortization of net actuarial loss	421	1,493
Net periodic benefit cost/(credit)	1,767	1,688
Settlement charge	0	49,128
Net benefit cost/(credit)	1,767	50,816
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	45	86
Interest cost	1,405	916
Expected return on assets	0	0
Amortization of prior service cost/(income)	(3,068)	(3,366)
Amortization of net actuarial loss	621	1,412
Net periodic benefit cost/(credit)	(997)	(952)
Settlement charge	0	0
Net benefit cost/(credit)	$ (997)	$ (952)