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Pension and Postretirement Benefits (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
plan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan expense $ 20,000 $ 20,400 $ 18,700
Postretirement Medical Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.32% 3.27% 4.20%
Company contributions $ 3,200 $ 2,900 $ 3,200
Assumed rate of increase in medical costs 7.00% 7.50% 7.00%
Minimum medical cost rate to be acheived 5.00%    
United States | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.62% 3.41% 4.34%
Long-term rate of return on assets 6.00% 6.00% 6.00%
Company contributions $ 1,412 $ 20,552  
United States | Pension Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in the next year $ 20,000    
United States | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, target allocation (as a percent) 43.00%    
United States | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, target allocation (as a percent) 57.00%    
United States | Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, target allocation (as a percent) 57.00% 57.00%  
Plan assets, actual allocation (as a percent) 56.00% 59.00%  
Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate     2.42%
Long-term rate of return on assets     3.62%
Foreign Plan | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 1.23% 1.61%  
Long-term rate of return on assets 2.37% 3.37%  
Company contributions $ 11,279 $ 16,782  
Estimated contributions in the next year $ 2,000    
Number of plans Non-US Assets | plan 2    
Foreign Plan | Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, target allocation (as a percent) 51.00% 50.00%  
Plan assets, actual allocation (as a percent) 51.00% 50.00%  
Foreign Plan | U.K. , the Netherlands and Canadian Plan Assets | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, actual allocation (as a percent) 94.00%