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Administrative expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of administrative expense [Line Items]      
Administrative expenses. $ 67,728 $ 67,585 $ 67,185
Personnel expenses      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 32,697 32,209 34,500
Professional fees      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 10,920 12,393 10,517
Sundry charges [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 9,070 8,968 7,766
Depreciation and amortization [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 2,460 3,680 3,700
Board of Directors' participation [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 3,873 1,992 2,178
Insurance [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,302 1,748 1,272
Software licenses [member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,420 1,723 1,731
Subscriptions and quotes [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,366 1,426 1,405
Communications [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 825 854 973
Donations [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 251 607 708
Maintenance and repairs [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 546 546 579
Consumption of materials and supplies      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 242 398 393
Canons and tributes [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 447 369 318
Short-term and low-value lease      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 1,554 294 611
Transport      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 525 278 255
Travel and mobility [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. 230 100 153
Allowance for doubtful accounts [Member]      
Disclosure of administrative expense [Line Items]      
Administrative expenses. $ 0 $ 0 $ 126