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Commitments and contingencies (Schedule of Provision for Contingencies) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss contingency accrual      
Balance at beginning of period $ 42,067 $ 46,031 $ 36,684
Accruals, net 17,441 23,995 35,999
Settlements (17,768) (19,702) (25,427)
Reclassifications and increase of judicial deposits 0 0 (650)
Translation (2,902) (8,257) (575)
Balance at end of period 38,838 42,067 46,031
Judicial deposits      
Balance at beginning of period (13,558) (18,075) (18,572)
Accruals, net 0 0 161
Settlements 0 0 0
Reclassifications and increase of judicial deposits 354 1,843 (60)
Translation 524 2,674 396
Balance at end of period (12,680) (13,558) (18,075)
Provision for contingencies      
Balance at beginning of period 28,509 27,956 18,112
Accruals, net 17,441 23,995 36,160
Settlements (17,768) (19,702) (25,427)
Reclassifications and increase of judicial deposits 354 1,843 (710)
Translation (2,378) (5,583) (179)
Balance at end of period 26,158 28,509 27,956
Tax Contingencies in Brazil      
Loss contingency accrual      
Balance at beginning of period 9,497 9,324 13,312
Accruals, net 1,455 1,805 (2,599)
Settlements 0 0 (337)
Reclassifications and increase of judicial deposits 0 0 (667)
Translation (357) (1,632) (385)
Balance at end of period 10,595 9,497 9,324
Labor Contingencies in Brazil      
Loss contingency accrual      
Balance at beginning of period 21,108 21,061 11,150
Accruals, net 12,916 20,785 31,448
Settlements (16,068) (17,718) (21,130)
Reclassifications and increase of judicial deposits 0 0 0
Translation (1,117) (3,020) (407)
Balance at end of period 16,839 21,108 21,061
Other      
Loss contingency accrual      
Balance at beginning of period 11,462 15,646 12,222
Accruals, net 3,070 1,405 7,150
Settlements (1,700) (1,984) (3,960)
Reclassifications and increase of judicial deposits 0 0 17
Translation (1,428) (3,605) 217
Balance at end of period $ 11,404 $ 11,462 $ 15,646