Retirement Plans and Postretirement Medical Benefits (Benefit Obligations and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 1,609,125	$ 1,729,515
Projected benefit obligation
Benefit obligation - beginning of year	1,729,959	1,613,054
Service cost	102	86	$ 83
Interest cost	42,434	52,103	63,171
Actuarial (gain) loss	(53,133)	185,306
Foreign currency changes	0	0
Settlements and curtailments	(1,429)	(3,854)
Benefits paid	(108,425)	(116,736)
Benefit obligation - end of year	1,609,508	1,729,959	1,613,054
Fair value of plan assets
Fair value of plan assets - beginning of year	1,601,786	1,487,018
Actual return on plan assets	51,828	225,812
Company contributions	5,397	9,546
Settlements and curtailments	(1,429)	(3,854)
Foreign currency changes	0	0
Benefits paid	(108,425)	(116,736)
Fair value of plan assets - end of year	1,549,157	1,601,786	1,487,018
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	0	465
Current liability	(5,883)	(5,843)
Noncurrent liability	(54,468)	(122,795)
Funded status	(60,351)	(128,173)
Pension Benefits | Foreign
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	762,558	829,413
Projected benefit obligation
Benefit obligation - beginning of year	830,674	746,942
Service cost	1,528	1,650	1,543
Interest cost	11,811	13,379	17,853
Actuarial (gain) loss	(37,197)	76,006
Foreign currency changes	(10,747)	29,128
Settlements and curtailments	0	(15,171)
Benefits paid	(25,601)	(21,260)
Benefit obligation - end of year	770,468	830,674	746,942
Fair value of plan assets
Fair value of plan assets - beginning of year	742,639	668,308
Actual return on plan assets	17,929	78,120
Company contributions	9,686	9,674
Settlements and curtailments	0	(15,171)
Foreign currency changes	(7,210)	22,968
Benefits paid	(25,601)	(21,260)
Fair value of plan assets - end of year	737,443	742,639	668,308
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset	29,309	26,053
Current liability	(1,345)	(1,444)
Noncurrent liability	(60,989)	(112,644)
Funded status	(33,025)	(88,035)
Nonpension postretirement benefit plans
Projected benefit obligation
Benefit obligation - beginning of year	169,210	164,104
Service cost	909	885	967
Interest cost	3,755	4,993	6,584
Actuarial (gain) loss	(22,305)	11,496
Foreign currency changes	123	340
Benefits paid	(12,176)	(12,608)
Benefit obligation - end of year	139,516	169,210	164,104
Fair value of plan assets
Fair value of plan assets - beginning of year	0	0
Company contributions	12,176	12,608
Benefits paid	(12,176)	(12,608)
Fair value of plan assets - end of year	0	0	$ 0
Amounts recognized in the Consolidated Balance Sheets
Current liability	(12,841)	(15,372)
Noncurrent liability	(126,675)	(153,838)
Funded status	(139,516)	(169,210)
Nonpension postretirement benefit plans | United States
Projected benefit obligation
Benefit obligation - beginning of year	153,000
Benefit obligation - end of year	$ 126,000	$ 153,000