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Retirement Plans and Postretirement Medical Benefits (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]                      
Eligibility age for retiree medical benefits                 55 years    
Pension plan settlement                 $ 31,329 $ 0 $ 0
Other components of net pension and postretirement cost                 22,425 5,413 5,276
Income from discontinued operations, net of tax $ (15,856) $ 29,848 $ 1,208 $ 8,487 $ 12,908 $ 11,921 $ 7,440 $ 7,709 $ 23,687 39,978 $ 17,036
Percent of all foreign plan assets                 76.00%    
Fair value of plan assets $ 426,000       $ 477,000       $ 426,000 $ 477,000  
Expected return on plan assets                 6.25% 6.25%  
Assumed health care cost trend rate 7.00%       7.00%       7.00% 7.00%  
Next year's assumed health care cost trend rate 6.50%               6.50%    
Assumed health care cost trend rate decline 5.00%               5.00%    
Total contributions to defined contribution plans                 $ 31,000 $ 31,000  
United States                      
Defined Benefit Plan Disclosure [Line Items]                      
Next year's anticipated total contributions to pension plans $ 11,000               $ 11,000    
Nominal rate of return 6.75%               6.75%    
Fair value of plan assets $ 1,326,296       $ 1,557,069       $ 1,326,296 $ 1,557,069  
Expected return on plan assets                 7.00% 6.75% 7.00%
United States | Pension Benefits                      
Defined Benefit Plan Disclosure [Line Items]                      
Pension plan settlement                 $ 45,000    
Other components of net pension and postretirement cost                 32,000    
Income from discontinued operations, net of tax                 13,000    
Foreign                      
Defined Benefit Plan Disclosure [Line Items]                      
Next year's anticipated total contributions to pension plans $ 11,000               $ 11,000    
Nominal rate of return 6.25%               6.25%    
Fair value of plan assets $ 426,446       $ 476,825       $ 426,446 $ 476,825