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Short-term and long-term investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt securities | $ 82,879 | $ 23,226
Equity securities, FV-NI | 39,143 | 48,598
Total | 122,022 | 71,824
Debt securities, short-term investments | 67,872 | 8,227
Total Short-term investments | 77,693 | 22,310
Debt securities, long-term investments | 15,007 | 14,999
Total Long-term investments | 44,329 | 49,514
Certificates of deposit and other time deposits |  |
Investment Holdings [Line Items] |  |
Debt securities | 82,879 | 23,226
Equity securities, FV-NI | 0 | 0
Total | 82,879 | 23,226
Investments in mutual funds and common stock |  |
Investment Holdings [Line Items] |  |
Debt securities | 0 | 0
Equity securities, FV-NI | 39,143 | 48,598
Total | 39,143 | 48,598
Short-term Investments |  |
Investment Holdings [Line Items] |  |
Equity securities, FV-NI | 9,821 | 14,083
Other long-term Investments |  |
Investment Holdings [Line Items] |  |
Equity securities, FV-NI | $ 29,322 | $ 34,515

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