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Commitments and contingencies - Other commitments (Details) - Contractual Obligations [Member]
$ in Thousands
Dec. 31, 2019
USD ($)
2020  
Disclosure of other provisions [line items]  
Other commitments $ 58,715
2021  
Disclosure of other provisions [line items]  
Other commitments 1,390
2022  
Disclosure of other provisions [line items]  
Other commitments 539
2023  
Disclosure of other provisions [line items]  
Other commitments 539
2024  
Disclosure of other provisions [line items]  
Other commitments 539
Thereafter  
Disclosure of other provisions [line items]  
Other commitments $ 3,273