Financial instruments - Fair value of derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Foreign Currency Exchange Contracts | Other liabilities
Derivatives Fair Value [Line Items]
Total liability derivatives	$ 0	$ 34,125
Cash Flow Hedging
Derivatives Fair Value [Line Items]
Total asset derivatives	33,291	21,858
Total liability derivatives	1,140	35,995
Cash Flow Hedging | Prepaid expenses and other current assets
Derivatives Fair Value [Line Items]
Total asset derivatives	23,731	21,858
Cash Flow Hedging | Other assets
Derivatives Fair Value [Line Items]
Total asset derivatives	9,560	0
Cash Flow Hedging | Foreign Currency Exchange Contracts | Other liabilities
Derivatives Fair Value [Line Items]
Total liability derivatives	1,140	1,870
Cash Flow Hedging | Foreign Currency Exchange Contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives Fair Value [Line Items]
Total asset derivatives	1,957	1,691
Cash Flow Hedging | Foreign Currency Exchange Contracts | Designated as Hedging Instrument | Other liabilities
Derivatives Fair Value [Line Items]
Total liability derivatives	993	1,504
Cash Flow Hedging | Foreign Currency Exchange Contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives Fair Value [Line Items]
Total asset derivatives	56	61
Cash Flow Hedging | Foreign Currency Exchange Contracts | Not Designated as Hedging Instrument | Other liabilities
Derivatives Fair Value [Line Items]
Total liability derivatives	147	366
Cash Flow Hedging | Cross Currency Interest Rate Contract | Prepaid expenses and other current assets
Derivatives Fair Value [Line Items]
Total asset derivatives	21,718	20,106
Cash Flow Hedging | Cross Currency Interest Rate Contract | Other assets
Derivatives Fair Value [Line Items]
Total asset derivatives	9,560	0
Cash Flow Hedging | Cross Currency Interest Rate Contract | Other liabilities
Derivatives Fair Value [Line Items]
Total liability derivatives	$ 0	$ 34,125