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Commitments and contingencies - Right-of-use lease asset balances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commitments and contingencies    
Carrying amount, January 1, 2021 $ 267,168 $ 82,794
ROU assets acquired (Note 4) 7,129 155,662
Difference in exchange (52)  
Additions to leased assets 44,342 53,527
Depreciation charges (34,237) (22,553)
Changes in assets held for sale 761 (2,262)
Carrying amount, December 31, 2021 $ 285,111 $ 267,168