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Financial instruments - Payments Made on Single Series Bonds, Fourth Issue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Single series bond Four | Interest payment      
Financial instruments [Line Items]      
Repayments of bonds, notes and debentures $ 10,938 $ 10,938 $ 10,938