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Commitments and contingencies - Schedule of Provision for Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss contingency accrual      
Balance at beginning of period $ 38,838 $ 42,067 $ 46,031
Accruals, net 15,330 17,441 23,995
Settlements (11,920) (17,768) (19,702)
Reclassifications and increase of judicial deposits 435 0 0
Translation (7,600) (2,902) (8,257)
Balance at end of period 35,083 38,838 42,067
Judicial deposits      
Balance at beginning of period (12,680) (13,558) (18,075)
Accruals, net 0 0 0
Settlements 0 0 0
Reclassifications and increase of judicial deposits 1,626 354 1,843
Translation 2,919 524 2,674
Balance at end of period (8,135) (12,680) (13,558)
Provision for contingencies      
Balance at beginning of period 26,158 28,509 27,956
Accruals, net 15,330 17,441 23,995
Settlements (11,920) (17,768) (19,702)
Reclassifications and increase of judicial deposits 2,061 354 1,843
Translation (4,681) (2,378) (5,583)
Balance at end of period 26,948 26,158 28,509
Tax Contingencies in Brazil      
Loss contingency accrual      
Balance at beginning of period 10,595 9,497 9,324
Accruals, net 2,040 1,455 1,805
Settlements 0 0 0
Reclassifications and increase of judicial deposits 435 0 0
Translation (2,408) (357) (1,632)
Balance at end of period 10,662 10,595 9,497
Labor Contingencies in Brazil      
Loss contingency accrual      
Balance at beginning of period 16,839 21,108 21,061
Accruals, net 12,087 12,916 20,785
Settlements (10,499) (16,068) (17,718)
Reclassifications and increase of judicial deposits 0 0 0
Translation (3,913) (1,117) (3,020)
Balance at end of period 14,514 16,839 21,108
Other      
Loss contingency accrual      
Balance at beginning of period 11,404 11,462 15,646
Accruals, net 1,203 3,070 1,405
Settlements (1,421) (1,700) (1,984)
Reclassifications and increase of judicial deposits 0 0 0
Translation (1,279) (1,428) (3,605)
Balance at end of period $ 9,907 $ 11,404 $ 11,462