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Derivative instruments - Cash Flow Hedges Schedule Footnote (Details) - Cross-currency interest rate swap - Cash Flow Hedging - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign currency exchange results | $ 12,392 | $ 40,353 | $ 6,346
Net interest expense | (3,828) | (2,977) | (8,402)
Total | $ 8,564 | $ 37,376 | $ (2,056)

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