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Derivative instruments - Cash Flow Hedges Schedule Footnote (Details) - Cash Flow Hedging - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total |  |  | $ 31,969
Cross-currency interest rate swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign currency exchange results | $ 40,353 | $ 6,346 | 28,588
Net interest expense | (2,977) | (8,402) | (9,700)
Total | $ 37,376 | $ (2,056) | $ 18,888

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