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Non-current bank credit lines and loan facilities - Schedule of Contractual Maturities of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 (remaining) $ 13,788  
2022 55,150  
2023 55,150  
2024 55,150  
2025 and thereafter 5,821,975  
Total debt $ 6,001,213 $ 350,000