Pensions and Other Postretirement Benefit Plans (Schedule of Funded Status of Plans and Composition of Accrued Pension Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Funded status		$ 6,200
Noncurrent asset	$ 16,200		$ 32,500
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74,929		225,327	$ 239,051
Benefit obligation	83,730		230,790	245,800
Funded status	(8,801)		(5,463)
Noncurrent asset	16,234		32,504
Current liability	(1,974)		(7,116)
Noncurrent liability	(23,061)		(30,851)
Net amount recognized	(8,801)		(5,463)
Net actuarial loss	17,915		52,138
Prior service cost/(credit)	(134)		256
Net amount recognized	17,781		52,394
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0	0
Benefit obligation	35,658		44,884	$ 47,977
Funded status	(35,658)		(44,884)
Noncurrent asset	0		0
Current liability	(3,660)		(3,627)
Noncurrent liability	(31,998)		(41,257)
Net amount recognized	(35,658)		(44,884)
Net actuarial loss	8,958		17,483
Prior service cost/(credit)	(4,574)		(8,458)
Net amount recognized	$ 4,384		$ 9,025