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Investments in debt and equity securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Investments | The Company’s short-term and long-term debt and equity investments consist of the following:
| June 30, 2020 |  | December 31, 2019
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 143,059 |  |  | $ | — |  |  | $ | 143,059 |  |  | $ | 8,140 |  |  | $ | — |  |  | $ | 8,140 |
Investments in mutual funds and common stock | — |  |  | 39,396 |  |  | 39,396 |  |  | — |  |  | 39,951 |  |  | 39,951 |
| $ | 143,059 |  |  | $ | 39,396 |  |  | $ | 182,455 |  |  | $ | 8,140 |  |  | $ | 39,951 |  |  | $ | 48,091 |
Short-term investments | $ | 143,059 |  |  | $ | 11,056 |  |  | $ | 154,115 |  |  | $ | 8,140 |  |  | $ | 3,432 |  |  | $ | 11,572 |
Long-term investments | — |  |  | 28,340 |  |  | 28,340 |  |  | — |  |  | 36,519 |  |  | 36,519 |
| $ | 143,059 |  |  | $ | 39,396 |  |  | $ | 182,455 |  |  | $ | 8,140 |  |  | $ | 39,951 |  |  | $ | 48,091 |

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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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