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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Pre-tax income $ 118,953 $ 85,169 $ 182,813
Weighted-average statutory income tax rate 36.60% 42.70% 35.50%
Income tax expense at weighted-average statutory tax rate on pre-tax income $ 43,488 $ 36,354 $ 64,901
Change in valuation allowance (24,864) (24,307) (21,241)
Expiration and changes in tax loss carryforwards 17,799 18,599 12,785
Venezuelan remeasurement and inflationary impacts 1,743 16,857 2,683
Non-taxable income and non-deductible expenses 7,667 8,406 10,157
Tax benefits (9,667) (11,403) (10,744)
Income taxes withholdings on intercompany transactions 5,005 7,723 6,804
Differences including exchange rate, inflation adjustment and filing differences (2,647) (2,815) (11,909)
Alternative Taxes 658 (1,283) 156
Others (345) 5 (278)
Income tax expense $ 38,837 $ 48,136 $ 53,314