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Financing Arrangements - Consolidated Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Nov. 30, 2014
Sep. 30, 2011
Current:          
Current debt $ 27,361 $ 82,243      
Long-Term:          
Long-term debt 1,591,598 1,517,949      
Revolving Credit Facility          
Current:          
Current debt   52,735      
1.750% Senior Notes          
Long-Term:          
Long-term debt $ 597,674 $ 523,629      
Interest rates on debt          
Interest rate (as a percent) 1.75% 1.75% 1.75%    
3.375% Senior Notes          
Long-Term:          
Long-term debt $ 496,859 $ 496,011      
Interest rates on debt          
Interest rate (as a percent) 3.375% 3.375%     3.375%
3.5% Senior Notes          
Long-Term:          
Long-term debt $ 493,320 $ 492,360      
Interest rates on debt          
Interest rate (as a percent) 3.50% 3.50%   3.50%  
Other borrowings          
Current:          
Current debt $ 27,361 $ 29,508      
Long-Term:          
Long-term debt $ 3,745 $ 5,949