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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%