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Debt and Lease Obligations (Debt Including Capital Lease Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mar. 17, 2015
Nov. 01, 2013
Sep. 11, 2012
Debt Instrument [Line Items]          
Long-term debt $ 1,575,257        
Capital lease obligations and other borrowings 22,197 $ 33,286      
Debt and capital lease obligations 1,575,257 1,570,623      
Less amounts due within one year 75,599 85,365      
Total debt due after one year $ 1,499,658 $ 1,485,258      
2022 EUR Senior notes [Member]          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 1.25% 1.25% 1.25%    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 5,335 $ 5,748      
Long-term debt $ 594,465 $ 519,902      
2023 Senior notes [Member]          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 4.00% 4.00%   4.00%  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 2,590 $ 2,972      
Long-term debt $ 297,410 $ 297,028      
2022 Senior notes [Member]          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 3.50% 3.50%     3.50%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 3,230 $ 3,848      
Long-term debt $ 496,770 $ 496,152      
Term Loan          
Debt Instrument [Line Items]          
Interest rate (as a percentage) 3.19% 2.25%      
Debt Issuance Costs, Net $ 585 $ 745      
Long-term debt $ 164,415 $ 224,255