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Borrowings and debt (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of long-term borrowings [Line Items] |  |
Average outstanding balance during the year | $ 1,477,788 | $ 1,874,435
Maximum outstanding balance at any month - end | 2,010,078 | 2,054,138
Less: Prepaid commission | (4,211) | (5,133)
Total long-term borrowings and debt, net | 1,143,055 | 1,781,871
Total | 1,138,844 | 1,776,738
Long-term borrowings [member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 423,011 | 692,474
Long-term Debt [member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 720,044 | 1,089,397
US Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 753,981 | 1,392,995
Mexican Peso [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 206,750 | 219,347
Japanese Yen [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 98,711 | 95,238
Euros Member [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 60,178 | 52,574
Australian Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 23,435 | 21,717
Floating interest rate [member] | Long-term borrowings [member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 379,000 | 631,326
Floating interest rate [member] | Long-term Debt [member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 187,739 | 167,918
Fixed interest rate [member] | Long-term borrowings [member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | 44,011 | 61,148
Fixed interest rate [member] | Long-term Debt [member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Total | $ 532,305 | $ 921,479
Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Euros Member [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 3.75% | 3.75%
Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Australian Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 3.33% | 3.33%
Bottom of range [member] | Floating interest rate [member] | Long Term Borrowings And Debt [Member] | US Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 2.61% | 1.66%
Bottom of range [member] | Floating interest rate [member] | Long Term Borrowings And Debt [Member] | Mexican Peso [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 7.99% | 6.19%
Bottom of range [member] | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | US Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 1.35% | 2.85%
Bottom of range [member] | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Mexican Peso [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 4.89% | 4.75%
Bottom of range [member] | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Japanese Yen [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 0.46% | 0.46%
Weighted Average [Member] | Long Term Borrowings And Debt [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 3.60% | 2.98%
Weighted Average [Member] | During the Year [Member] | Long Term Borrowings And Debt [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 3.43% | 2.84%
Top of range [member] | Floating interest rate [member] | Long Term Borrowings And Debt [Member] | US Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 3.01% | 2.49%
Top of range [member] | Floating interest rate [member] | Long Term Borrowings And Debt [Member] | Mexican Peso [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 8.00% | 6.54%
Top of range [member] | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | US Dollar [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 3.25% | 3.75%
Top of range [member] | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Mexican Peso [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 9.09% | 8.90%
Top of range [member] | Fixed interest rate [member] | Long Term Borrowings And Debt [Member] | Japanese Yen [Member] |  |
Disclosure of long-term borrowings [Line Items] |  |
Borrowings, interest rate | 0.81% | 0.81%

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