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Debt and Finance Lease Obligations (Debt Including Capital Lease Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Mar. 17, 2015
Nov. 01, 2013
Sep. 11, 2012
Debt Instrument [Line Items]          
Long-term debt $ 1,377,249        
Finance lease obligations and other borrowings 23,103        
Finance lease obligations and other borrowings   $ 13,541      
Debt and finance lease obligations 1,377,249 1,483,047      
Less amounts due within one year 11,272 68,218      
Total debt due after one year $ 1,365,977 $ 1,414,829      
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 $ 2,653 $ 3,914      
Long-term debt $ 557,847 $ 569,536      
2022 Senior notes          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 3.50% 3.50%     3.50%
Unamortized discount and debt issuance costs $ 1,924 $ 2,589      
Long-term debt $ 498,076 $ 497,411      
2023 Senior notes          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 4.00% 4.00%   4.00%  
Unamortized discount and debt issuance costs $ 1,777 $ 2,192      
Long-term debt $ 298,223 $ 297,808      
Term Loan          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 0.00% 4.30%      
Debt issuance costs $ 0 $ 249      
Long-term debt $ 0 $ 104,751