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Short-term and long-term investments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Pre tax reclassification of net investment realized gain into net income |  | $ 360 |
Reclassification of net investment realized gain into net income, net of tax |  | $ 220 |
Investments in mutual funds and common stock |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity Securities, FV-NI, Gain (Loss) | $ 1,208 |  |
Equity Securities, FV-NI, Realized Gain | 4,490 |  |
Equity Securities, FV-NI, Unrealized Gain | $ 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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