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Financial instruments - Derivative Contract Maturities (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Series H bonds  
Financial instruments [Line Items]  
Contract amount $ 84,662
Series O bonds  
Financial instruments [Line Items]  
Contract amount 58,748
Series P bonds  
Financial instruments [Line Items]  
Contract amount 134,228
Series Q bonds  
Financial instruments [Line Items]  
Contract amount $ 123,370