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Investments in debt and equity securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments | The Company’s investments in these short-term and long-term debt and equity investments consist of the following:
| September 30, 2018 |  | December 31, 2017
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 2,230 |  |  | $ | — |  |  | $ | 2,230 |  |  | $ | 31,630 |  |  | $ | — |  |  | $ | 31,630 |
Investments in mutual funds and common stock | — |  |  | 37,547 |  |  | 37,547 |  |  | — |  |  | 38,895 |  |  | 38,895 |
| $ | 2,230 |  |  | $ | 37,547 |  |  | $ | 39,777 |  |  | $ | 31,630 |  |  | $ | 38,895 |  |  | $ | 70,525 |
Short-term investments | $ | 2,230 |  |  | $ | 2,500 |  |  | $ | 4,730 |  |  | $ | 31,630 |  |  | $ | 1,200 |  |  | $ | 32,830 |
Long-term investments | — |  |  | 35,047 |  |  | 35,047 |  |  | — |  |  | 37,695 |  |  | 37,695 |
| $ | 2,230 |  |  | $ | 37,547 |  |  | $ | 39,777 |  |  | $ | 31,630 |  |  | $ | 38,895 |  |  | $ | 70,525 |

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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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