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Retirement Plans and Postretirement Medical Benefits (Pretax Amounts Recognized in AOCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Document Fiscal Year Focus 2019  
Nonpension postretirement benefit plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss $ 33,272 $ 28,368
Prior service (credit) cost 502 823
Total 33,774 29,191
United States | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 772,850 809,836
Prior service (credit) cost (270) (330)
Transition asset 0 0
Total 772,580 809,506
Foreign | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 315,319 318,474
Prior service (credit) cost 8,317 8,496
Transition asset (11) (17)
Total $ 323,625 $ 326,953