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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%

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