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Income taxes (Schedule of Components of Income Tax Expense by Applying Weighted-Average Statutory Income Tax Rate) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Pre-tax income $ 85,169 $ 182,813 $ 138,629
Weighted-average statutory income tax rate (as a percent) 42.70% 35.50% 35.40%
Income tax expense at weighted-average statutory tax rate on pre-tax income $ 36,354 $ 64,901 $ 49,030
Change in valuation allowance (24,307) (21,241) (19,217)
Expiration and changes in tax loss carryforwards 18,599 12,785 18,234
Venezuelan Remeasurement And Inflationary Impacts 16,857 2,683 4,368
Non-taxable income and non-deductible expenses 8,406 10,157 12,915
Tax benefits, including Brazil and other (11,403) (10,744) (14,437)
Income taxes withholdings on intercompany transactions 7,723 6,804 22,379
Differences including exchange rate, inflation adjustment and filing differences (2,815) (11,909) (13,002)
Alternative Taxes (1,283) 156 (114)
Others 5 (278) (515)
Income tax expense $ 48,136 $ 53,314 $ 59,641