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Financial instruments - Payments Made on Series H Bonds (Details) - Series H bonds - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Principal payment      
Financial instruments [Line Items]      
Repayments of bonds, notes and debentures $ 5,241 $ 6,661 $ 6,601
CCS Coverage      
Financial instruments [Line Items]      
Repayments of bonds, notes and debentures $ 2,126 $ 1,598 $ 2,575