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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt $ 400,890  
Less: current portion (16,019) (41,600)
Long-Term Debt    
Long-term debt 384,871 347,131
US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 363,958  
Less: current portion 0  
Long-Term Debt    
Long-term debt 363,958  
Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 36,932  
Less: current portion (16,019)  
Long-Term Debt    
Long-term debt 20,913  
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 184,871  
Credit facility [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 163,958  
Credit facility [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 20,913  
Other local arrangements [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 16,019  
Other local arrangements [Member] | US Dollar Amounts [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt 0  
Other local arrangements [Member] | Other Principal Trading Currencies [Member]
   
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt    
Total debt $ 16,019