Retirement Plans and Postretirement Medical Benefits (Benefit Obligations and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 1,205,108	$ 1,205,135
Projected benefit obligation
Benefit obligation - beginning of year	1,205,183	1,609,508
Service cost	44	55	$ 102
Interest cost	63,533	44,348	42,434
Net actuarial loss (gain)	36,882	(349,261)
Foreign currency changes	0	0
Settlements	(2,892)	(1,574)
Benefits paid	(97,610)	(97,893)
Benefit obligation - end of year	1,205,140	1,205,183	1,609,508
Fair value of plan assets
Fair value of plan assets - beginning of year	1,161,361	1,549,157
Actual return on plan assets	86,044	(293,968)
Company contributions	6,587	5,639
Settlements	(2,892)	(1,574)
Foreign currency changes	0	0
Benefits paid	(97,610)	(97,893)
Fair value of plan assets - end of year	1,153,490	1,161,361	1,549,157
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	0	0
Current liability	(5,057)	(7,294)
Noncurrent liability	(46,593)	(36,528)
Funded status	(51,650)	(43,822)
Pension Benefits | Foreign
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	488,531	447,401
Projected benefit obligation
Benefit obligation - beginning of year	451,337	770,468
Service cost	766	1,214	1,528
Interest cost	21,238	13,568	11,811
Net actuarial loss (gain)	22,984	(242,488)
Foreign currency changes	19,854	(68,519)
Settlements	(213)	0
Benefits paid	(23,199)	(22,906)
Benefit obligation - end of year	492,767	451,337	770,468
Fair value of plan assets
Fair value of plan assets - beginning of year	438,403	737,443
Actual return on plan assets	17,057	(218,325)
Company contributions	16,034	8,731
Settlements	(213)	0
Foreign currency changes	18,605	(66,540)
Benefits paid	(23,199)	(22,906)
Fair value of plan assets - end of year	466,687	438,403	737,443
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	27,805	26,570
Current liability	(1,694)	(1,351)
Noncurrent liability	(52,191)	(38,153)
Funded status	(26,080)	(12,934)
Nonpension postretirement benefit plans
Projected benefit obligation
Benefit obligation - beginning of year	99,275	139,516
Service cost	367	731	909
Interest cost	5,031	3,679	3,755
Net actuarial loss (gain)	(206)	(31,512)
Foreign currency changes	214	(740)
Benefits paid	(11,194)	(12,399)
Benefit obligation - end of year	93,487	99,275	139,516
Fair value of plan assets
Fair value of plan assets - beginning of year	0	0
Company contributions	11,194	12,399
Benefits paid	(11,194)	(12,399)
Fair value of plan assets - end of year	0	0	$ 0
Amounts recognized in the Consolidated Balance Sheets
Current liability	(10,265)	(11,530)
Noncurrent liability	(83,222)	(87,745)
Funded status	(93,487)	(99,275)
Nonpension postretirement benefit plans | United States
Projected benefit obligation
Benefit obligation - beginning of year	90,000
Benefit obligation - end of year	$ 84,000	$ 90,000