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Administrative expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of administrative expense [Line Items]      
Administrative expenses. $ 69,183 $ 67,728 $ 67,585
Personnel expenses      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 34,356 32,697 32,209
Professional fees      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 9,907 10,920 12,393
Sundry charges      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 8,915 9,070 8,968
Board of Directors' compensation      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 2,223 3,873 1,992
Short-term and low-value lease      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 2,021 1,554 294
Depreciation and amortization      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,998 2,460 3,680
Subscriptions and quotes      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,469 1,366 1,426
Insurance      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,326 1,302 1,748
Maintenance and repairs      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 712 546 546
Communications      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 748 825 854
Transport      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 673 525 278
Canons and tributes      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 541 447 369
Travel and mobility      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 258 230 100
Consumption of materials and supplies      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 218 242 398
Donations      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 0 251 607
Software licenses      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 0 1,420 1,723
Allowance for doubtful accounts [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. $ 3,818 $ 0 $ 0