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Investments in debt and equity securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Investments | The Company’s short-term and long-term debt and equity investments consist of the following:
| March 31, 2019 |  | December 31, 2018
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 2,235 |  |  | $ | — |  |  | $ | 2,235 |  |  | $ | 2,235 |  |  | $ | — |  |  | $ | 2,235 |
Investments in mutual funds and common stock | — |  |  | 36,214 |  |  | 36,214 |  |  | — |  |  | 36,124 |  |  | 36,124 |
| $ | 2,235 |  |  | $ | 36,214 |  |  | $ | 38,449 |  |  | $ | 2,235 |  |  | $ | 36,124 |  |  | $ | 38,359 |
Short-term investments | $ | 2,235 |  |  | $ | 1,800 |  |  | $ | 4,035 |  |  | $ | 2,235 |  |  | $ | 700 |  |  | $ | 2,935 |
Long-term investments | — |  |  | 34,414 |  |  | 34,414 |  |  | — |  |  | 35,424 |  |  | 35,424 |
| $ | 2,235 |  |  | $ | 36,214 |  |  | $ | 38,449 |  |  | $ | 2,235 |  |  | $ | 36,124 |  |  | $ | 38,359 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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