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Short-term borrowings and debt (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Borrowings:    
At fixed interest rates $ 1,289,851 $ 1,181,133
At floating interest rates 1,017,527 267,890
Total borrowings 2,307,378 1,449,023
Debt:    
At fixed interest rates 287,987 0
At floating interest rates 110,000 0
Total debt 397,987 0
Total short-term borrowings and debt 2,705,365 1,449,023
Average outstanding balance during the year 2,048,110 967,629
Maximum balance at any month-end 2,705,365 1,449,023
Weighted average interest rate at end of the year 1.09% 1.48%
Weighted average interest rate during the year 1.21% 1.79%
U S Dollar [Member]
    
Debt:    
Total short-term borrowings and debt 2,536,815 1,365,500
Euros [Member]
    
Debt:    
Total short-term borrowings and debt 0 39,633
Range of fixed interest rates on borrowings 0.00% 0.70%
Peso [Member]
    
Debt:    
Total short-term borrowings and debt 73,964 43,890
Range of fixed interest rates on borrowings   0.00%
Japanese Yen [Member]
    
Debt:    
Total short-term borrowings and debt 4,749 0
Range of fixed interest rates on borrowings 0.75% 0.00%
Swiss Franc [Member]
    
Debt:    
Total short-term borrowings and debt $ 89,837 $ 0
Range of fixed interest rates on borrowings 0.80% 0.00%
Maximum [Member] | U S Dollar [Member]
    
Debt:    
Range of fixed interest rates on borrowings 1.43% 1.92%
Range of floating interest rates on borrowings 1.47% 1.99%
Maximum [Member] | Peso [Member]
    
Debt:    
Range of fixed interest rates on borrowings 4.58%  
Range of floating interest rates on borrowings 4.24% 5.25%
Minimum [Member] | U S Dollar [Member]
    
Debt:    
Range of fixed interest rates on borrowings 0.67% 0.75%
Range of floating interest rates on borrowings 0.79% 1.06%
Minimum [Member] | Peso [Member]
    
Debt:    
Range of fixed interest rates on borrowings 4.13%  
Range of floating interest rates on borrowings 4.03% 5.14%