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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Pre-tax (loss) income $ (131,854) $ 118,953 $ 85,169
Weighted-average statutory income tax rate 22.90% 36.60% 42.70%
Income tax (benefit) expense at weighted-average statutory tax rate on pre-tax income (loss) $ (30,226) $ 43,488 $ 36,354
Change in valuation allowance 2,958 (24,864) (24,307)
Expiration and changes in tax loss carryforwards 13,820 17,799 18,599
Venezuelan remeasurement and inflationary impacts 1,682 1,743 16,857
Non-taxable income and non-deductible expenses 12,092 7,545 10,085
Tax benefits (1,701) (9,667) (11,403)
Income taxes withholdings on intercompany transactions 6,515 5,005 7,723
Differences including exchange rate, inflation adjustment and filing differences 6,684 (5,291) (2,574)
Alternative Taxes 2,054 658 (1,283)
Others 3,654 2,421 (1,915)
Income tax expense $ 17,532 $ 38,837 $ 48,136