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v3.19.3.a.u2

Short-term and long-term investments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Investments in mutual funds and common stock |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity Securities, FV-NI, Gain (Loss) | $ 4,383 | $ (1,208) |
Equity Securities, FV-NI, Realized Gain | 1,459 | 4,490 |
Net Increase (Decrease) In Unrealized Gains On Equity Securities | $ 2,924 | $ (5,698) |
Investment securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 5,662

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