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Administrative expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Expense by nature        
Impairment of withholding tax receivables $ 21,855 $ 10,508 $ 32,827 $ 35,112
Share-based payment expense 1,813 2,654 9,879 9,571
Business combination costs 578 161 958 1,647
Impairment of Goodwill     87,894  
Impairment of other fixed assets     31  
Net gain on disposal of property, plant and equipment (1,270) (386) (3,562) (952)
Other 1,783 3,211 $ 8,175 8,059
Cash flow projection period for assessment of withholding tax asset recoverability     5 years  
Administrative expense        
Expense by nature        
Staff costs 38,517 38,210 $ 104,135 114,765
Impairment of withholding tax receivables 21,855 10,508 32,827 35,112
Professional fees 10,971 14,231 38,065 43,634
Facilities, short term rental and upkeep 7,089 8,822 23,629 30,010
Amortization 4,113 1,429 6,241 4,225
Key management compensation 3,864 4,674 13,703 12,914
Depreciation 2,608 2,744 8,025 8,501
Travel costs 2,410 3,640 8,408 10,318
Share-based payment expense 1,813 2,654 9,879 9,571
Business combination costs 578 161 958 1,647
Operating taxes 406 266 1,075 382
Impairment of Goodwill     87,894  
Impairment of other fixed assets     31  
Net gain on disposal of property, plant and equipment (1,270) (386) (3,562) (952)
Other 4,145 6,882 16,250 21,750
Total $ 97,099 $ 93,835 $ 347,558 $ 291,877