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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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