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Other employee benefits (Schedule of detailed information about other employee benefits plan) (Details) - Other employee benefits [Member] - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Other Employee Benefits [Line Items]    
Other employee benefits liability - current $ 3,483 $ 3,530
Other employee benefits liability - non-current 86,340 128,588
Net liability $ 89,823 $ 132,118