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Debt and Finance Lease Obligations (Debt Including Capital Lease Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 14, 2020
Dec. 31, 2019
Mar. 17, 2015
Nov. 01, 2013
Sep. 11, 2012
Debt Instrument [Line Items]            
Long-term debt $ 1,726,906          
Finance lease obligations and other borrowings 25,390   $ 23,103      
Debt and finance lease obligations 1,726,906   1,377,249      
Less amounts due within one year 8,995   11,272      
Total debt due after one year $ 1,717,911   $ 1,365,977      
2022 EUR Senior notes            
Debt Instrument [Line Items]            
Interest rate (as a percentage) 1.25%   1.25% 1.25%    
Unamortized discount and debt issuance costs $ 1,070   $ 2,653      
Long-term debt $ 410,243   $ 557,847      
2022 Senior notes            
Debt Instrument [Line Items]            
Interest rate (as a percentage) 3.50%   3.50%     3.50%
Unamortized discount and debt issuance costs $ 1,235   $ 1,924      
Long-term debt $ 498,765   $ 498,076      
2023 Senior notes            
Debt Instrument [Line Items]            
Interest rate (as a percentage) 4.00%   4.00%   4.00%  
Unamortized discount and debt issuance costs $ 1,345   $ 1,777      
Long-term debt $ 298,655   $ 298,223      
2030 USD Senior notes            
Debt Instrument [Line Items]            
Interest rate (as a percentage) 3.50% 3.50% 3.50%      
Debt issuance costs $ 6,147          
Long-term debt $ 493,853   $ 0