Short-term and long-term investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Debt securities	$ 8,140	$ 2,235
Equity securities, FV-NI	39,951	36,124
Total	48,091	38,359
Debt securities, short-term investments	8,140	2,235
Total, short-term investments	11,572	2,935
Debt securities, long-term investments	0	0
Total, long-term investments	36,519	35,424
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	8,140	2,235
Equity securities, FV-NI	0	0
Total	8,140	2,235
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Debt securities	0	0
Equity securities, FV-NI	39,951	36,124
Total	39,951	36,124
Short-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	3,432	700
Other long-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	$ 36,519	$ 35,424

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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