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Employee benefits - Breakdown of pension and OPEB plans assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets $ 23,404 $ 0
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets 23,404 0
Current liabilities 222 222
Non-current liabilities 6,550 8,068
OPEB Plan    
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets 0 0
Current liabilities 5,595 5,779
Non-current liabilities $ 111,451 $ 112,557