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Retirement Plans and Postretirement Medical Benefits (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Eligibility age for retiree medical benefits 55 years    
Percent of all foreign plan assets 75.00%    
Fair value of plan assets $ 410,000 $ 399,000  
Expected return on plan assets 6.50% 7.00%  
Assumed health care cost trend rate 6.00% 6.00%  
Next year's assumed health care cost trend rate 7.00%    
Assumed health care cost trend rate decline 5.00%    
Total contributions to defined contribution plans $ 32,000 $ 28,000  
United States      
Defined Benefit Plan Disclosure [Line Items]      
Next year's anticipated total contributions to pension plans $ 8,000    
Nominal rate of return 6.75%    
Fair value of plan assets $ 1,463,350 $ 1,460,111  
Expected return on plan assets 7.00% 7.00% 7.00%
Benefit obligation $ 1,678,097 $ 1,689,885 $ 1,868,176
Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Next year's anticipated total contributions to pension plans $ 14,000    
Nominal rate of return 6.25%    
Fair value of plan assets $ 425,962 412,418  
Benefit obligation 688,172 647,112 715,287
U.S. nonpension postretirement plans      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation 174,000 198,000  
Nonpension postretirement benefit plans      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation $ 189,772 $ 211,878 $ 253,980