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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

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