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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt $ 485,032  
Less: current portion (120,025) (17,067)
Long-Term Debt    
Long-term debt 365,007 395,960
US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 429,366  
Less: current portion (100,429)  
Long-Term Debt    
Long-term debt 328,937  
Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 55,666  
Less: current portion (19,596)  
Long-Term Debt    
Long-term debt 36,070  
6.30% Senior Notes [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 100,000  
6.30% Senior Notes [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 100,000  
6.30% Senior Notes [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 0  
3.67% Senior Notes [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 50,000  
3.67% Senior Notes [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 50,000  
3.67% Senior Notes [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 0  
4.10% Senior Notes [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 50,000  
4.10% Senior Notes [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 50,000  
4.10% Senior Notes [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 0  
Credit facility [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 140,007  
Credit facility [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 103,937  
Credit facility [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 36,070  
Other local arrangements [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 20,025  
Other local arrangements [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 429  
Other local arrangements [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt $ 19,596