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Intangible assets (Tables)	12 Months Ended
Intangible assets (Tables)	Dec. 31, 2022
Intangible Assets And Goodwill [Abstract]
Reconciliation of carrying amount of goodwill and intangibles	At December 31, 2022 Intellectual Contracts property Total Cost Beginning of year $ 110,618 $ 118,819 $ 229,437 Effect of movements in exchange rates 8,027 - 8,027 End of year 118,645 118,819 237,464 Accumulated amortization and impairment Beginning of year 109,886 68,304 178,190 Amortization charge 739 3,454 4,193 Effect of movements in exchange rates 7,964 - 7,964 End of year 118,589 71,758 190,347 Net book value at December 31, 2022 $ 56 $ 47,061 $ 47,117 At December 31, 2021 Intellectual Contracts property Total Cost Beginning of year $ 111,388 $ 118,819 $ 230,207 Effect of movements in exchange rates (770) - (770) End of year 110,618 118,819 229,437 Accumulated amortization and impairment Beginning of year 109,663 64,722 174,385 Amortization charge 975 3,582 4,557 Effect of movements in exchange rates (752) - (752) End of year 109,886 68,304 178,190 Net book value at December 31, 2021 $ 732 $ 50,515 $ 51,247