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Commitments and contingencies (Schedule of Provision for Contingencies) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period $ 46,031 $ 36,684 $ 26,078
Accruals, net 23,995 35,999 28,577
Settlements (19,702) (25,427) (20,554)
Reclassifications and increase of judicial deposits 0 (650) (37)
Translation (8,257) (575) 2,620
Balance at end of period 42,067 46,031 36,684
Judicial Deposits [Roll Forward]      
Judicial deposits, beginning of period (18,075) (18,572) (5,500)
Judicial deposits, accruals 0 161 0
Judicial deposits, settlements 0 0 0
Judicial deposits, reclassifications 1,843 (60) (11,458)
Judicial deposits, translation 2,674 396 (1,614)
Judicial deposits, end of period (13,558) (18,075) (18,572)
Loss Contingency Accrual, Net of Deposits [Roll Forward]      
Balance at beginning of period 27,956 18,112 20,578
Accruals, net 23,995 36,160 28,577
Settlements (19,702) (25,427) (20,554)
Reclassifications and increase of judicial deposits 1,843 (710) (11,495)
Translation (5,583) (179) 1,006
Balance at end of period 28,509 27,956 18,112
Tax Contingencies in Brazil      
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period 9,324 13,312 5,118
Accruals, net 1,805 (2,599) 7,196
Settlements 0 (337) 0
Reclassifications and increase of judicial deposits 0 (667) 0
Translation (1,632) (385) 998
Balance at end of period 9,497 9,324 13,312
Labor Contingencies in Brazil      
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period 21,061 11,150 7,013
Accruals, net 20,785 31,448 19,903
Settlements (17,718) (21,130) (17,523)
Reclassifications and increase of judicial deposits 0 0 0
Translation (3,020) (407) 1,757
Balance at end of period 21,108 21,061 11,150
Other      
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period 15,646 12,222 13,947
Accruals, net 1,405 7,150 1,478
Settlements (1,984) (3,960) (3,031)
Reclassifications and increase of judicial deposits 0 17 (37)
Translation (3,605) 217 (135)
Balance at end of period $ 11,462 $ 15,646 $ 12,222