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Fair value measurements - Measurement of Fair Value of Major Asset and Liability classed (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) $ 1,955 $ 1,954
Available for sale investments (long-term) 51,164 46,804
Total assets 61,344 48,758
Total liabilities 270 2,411
Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 8,225  
Derivative instruments 270 2,411
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 1,955 1,954
Available for sale investments (long-term) 0 0
Total assets 1,955 1,954
Total liabilities 0 0
Level 1 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0  
Derivative instruments 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 0 0
Available for sale investments (long-term) 0 0
Total assets 8,225 0
Total liabilities 270 2,411
Level 2 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 8,225 0
Derivative instruments 270 2,411
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 0 0
Available for sale investments (long-term) 0 0
Total assets 0 0
Total liabilities 0 0
Level 3 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0  
Derivative instruments 0 0
Investments Measured at Net Asset Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 0 0
Available for sale investments (long-term) 51,164 46,804
Total assets 51,164 46,804
Total liabilities 0 0
Investments Measured at Net Asset Value | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0  
Derivative instruments $ 0 $ 0