Pension, Postretirement, and Other Benefit Plans (Schedule of Funded Status of Plans and Composition of Accrued Pension Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Funded status			$ 6,200
Noncurrent asset	$ 19,300	$ 16,200
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	112,688	74,929		$ 225,327
Benefit obligation	158,323	83,730		230,790
Funded status	(45,635)	(8,801)
Noncurrent asset	19,296	16,234
Current liability	(5,500)	(1,974)
Noncurrent liability	(59,431)	(23,061)
Net amount recognized	(45,635)	(8,801)
Net actuarial loss	22,512	17,915
Prior service cost/(credit)	(132)	(134)
Net amount recognized	22,380	17,781
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0		0
Benefit obligation	28,684	35,658		$ 44,884
Funded status	(28,684)	(35,658)
Noncurrent asset	0	0
Current liability	(2,808)	(3,660)
Noncurrent liability	(25,876)	(31,998)
Net amount recognized	(28,684)	(35,658)
Net actuarial loss	1,991	8,958
Prior service cost/(credit)	(484)	(4,574)
Net amount recognized	$ 1,507	$ 4,384