Retirement Plans and Postretirement Medical Benefits (Benefit Obligations and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 1,205,135	$ 1,609,125
Projected benefit obligation
Benefit obligation - beginning of year	1,609,508	1,729,959
Service cost	55	102	$ 86
Interest cost	44,348	42,434	52,103
Net actuarial gain	(349,261)	(53,133)
Foreign currency changes	0	0
Settlements	(1,574)	(1,429)
Benefits paid	(97,893)	(108,425)
Benefit obligation - end of year	1,205,183	1,609,508	1,729,959
Fair value of plan assets
Fair value of plan assets - beginning of year	1,549,157	1,601,786
Actual return on plan assets	(293,968)	51,828
Company contributions	5,639	5,397
Settlements	(1,574)	(1,429)
Foreign currency changes	0	0
Benefits paid	(97,893)	(108,425)
Fair value of plan assets - end of year	1,161,361	1,549,157	1,601,786
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	0	0
Current liability	(7,294)	(5,883)
Noncurrent liability	(36,528)	(54,468)
Funded status	(43,822)	(60,351)
Pension Benefits | Foreign
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	447,401	762,558
Projected benefit obligation
Benefit obligation - beginning of year	770,468	830,674
Service cost	1,214	1,528	1,650
Interest cost	13,568	11,811	13,379
Net actuarial gain	(242,488)	(37,197)
Foreign currency changes	(68,519)	(10,747)
Settlements	0	0
Benefits paid	(22,906)	(25,601)
Benefit obligation - end of year	451,337	770,468	830,674
Fair value of plan assets
Fair value of plan assets - beginning of year	737,443	742,639
Actual return on plan assets	(218,325)	17,929
Company contributions	8,731	9,686
Settlements	0	0
Foreign currency changes	(66,540)	(7,210)
Benefits paid	(22,906)	(25,601)
Fair value of plan assets - end of year	438,403	737,443	742,639
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	26,570	29,309
Current liability	(1,351)	(1,345)
Noncurrent liability	(38,153)	(60,989)
Funded status	(12,934)	(33,025)
Nonpension postretirement benefit plans
Projected benefit obligation
Benefit obligation - beginning of year	139,516	169,210
Service cost	731	909	885
Interest cost	3,679	3,755	4,993
Net actuarial gain	(31,512)	(22,305)
Foreign currency changes	(740)	123
Benefits paid	(12,399)	(12,176)
Benefit obligation - end of year	99,275	139,516	169,210
Fair value of plan assets
Fair value of plan assets - beginning of year	0	0
Company contributions	12,399	12,176
Benefits paid	(12,399)	(12,176)
Fair value of plan assets - end of year	0	0	$ 0
Amounts recognized in the Consolidated Balance Sheets
Current liability	(11,530)	(12,841)
Noncurrent liability	(87,745)	(126,675)
Funded status	(99,275)	(139,516)
Nonpension postretirement benefit plans | United States
Projected benefit obligation
Benefit obligation - beginning of year	126,000
Benefit obligation - end of year	$ 90,000	$ 126,000