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Short-term and long-term investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt securities | $ 22,109 | $ 82,879
Equity securities, FV-NI | 37,391 | 39,143
Total | 59,500 | 122,022
Debt securities, short-term investments | 7,110 | 67,872
Total Short-term investments | 11,610 | 77,693
Debt securities, long-term investments | 14,999 | 15,007
Total Long-term investments | 47,890 | 44,329
Certificates of deposit and other time deposits |  |
Investment Holdings [Line Items] |  |
Debt securities | 22,109 | 82,879
Equity securities, FV-NI | 0 | 0
Total | 22,109 | 82,879
Investments in mutual funds and common stock |  |
Investment Holdings [Line Items] |  |
Debt securities | 0 | 0
Equity securities, FV-NI | 37,391 | 39,143
Total | 37,391 | 39,143
Short-term Investments |  |
Investment Holdings [Line Items] |  |
Equity securities, FV-NI | 4,500 | 9,821
Other long-term Investments |  |
Investment Holdings [Line Items] |  |
Equity securities, FV-NI | $ 32,891 | $ 29,322

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