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Borrowings and long-term debt (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Borrowings: |  |
At fixed interest rates with due dates from April 2013 to September 2013 | $ 1,435 | $ 15,696
At floating interest rates with due dates from January 2013 to September 2014 | 1,296,785 | 1,426,237
Total borrowings | 1,298,220 | 1,441,933
Debt: |  |
At fixed interest rates with due dates from November 2014 to April 2017 | 453,373 | 45,615
At floating interest rates with due dates in March 2015 | 153,947 | 0
Total debt | 607,320 | 45,615
Total borrowings and long-term debt outstanding | 1,905,540 | 1,487,548
Average outstanding balance during the year | 1,893,580 | 1,391,440
Maximum outstanding balance at any month-end | 2,152,584 | 1,548,404
Weighted average interest rate at the end of the year | 2.92% | 2.16%
Weighted average interest rate during the year | 2.74% | 1.94%
Mexican Pesos [Member] |  |
Debt: |  |
Total borrowings and long-term debt outstanding | 338,760 | 172,358
Peruvian Soles [Member] |  |
Debt: |  |
Total borrowings and long-term debt outstanding | 48,188 | 45,615
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 6.50% | 6.50%
U S Dollar [Member] |  |
Debt: |  |
Total borrowings and long-term debt outstanding | $ 1,518,592 | $ 1,269,575
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 3.75% | 1.50%
Maximum [Member] | Mexican Pesos [Member] |  |
Debt: |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 9.90% | 9.90%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 6.34% | 6.30%
Maximum [Member] | U S Dollar [Member] |  |
Debt: |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 2.40% | 2.30%
Minimum [Member] | Mexican Pesos [Member] |  |
Debt: |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 7.60% | 7.50%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 5.50% | 5.66%
Minimum [Member] | U S Dollar [Member] |  |
Debt: |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 0.68% | 0.62%

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- Definition Borrowings with fixed interest as of balance sheet date. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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