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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