Short-term and long-term investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Debt securities	$ 8,217	$ 8,140
Equity securities, FV-NI	44,077	39,951
Total	52,294	48,091
Debt securities, short-term investments	8,217	8,140
Total, short-term investments	20,101	11,572
Debt securities, long-term investments	0	0
Total, long-term investments	32,193	36,519
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	8,217	8,140
Equity securities, FV-NI	0	0
Total	8,217	8,140
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Debt securities	0	0
Equity securities, FV-NI	44,077	39,951
Total	44,077	39,951
Short-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	11,884	3,432
Other long-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	$ 32,193	$ 36,519

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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