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Investments in debt and equity securities | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments in debt and equity securities | Short-term and long-term investments The Company’s short-term and long-term debt and equity investments, consisting of debt instruments classified as held-to-maturity and equity investments with readily determinable fair values or redemption values, were as follows:
| March 31, 2021 |  | December 31, 2020
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 8,221 |  |  | $ | — |  |  | $ | 8,221 |  |  | $ | 8,217 |  |  | $ | — |  |  | $ | 8,217 |
Investments in mutual funds and common stock | — |  |  | 34,730 |  |  | 34,730 |  |  | — |  |  | 44,077 |  |  | 44,077 |
| $ | 8,221 |  |  | $ | 34,730 |  |  | $ | 42,951 |  |  | $ | 8,217 |  |  | $ | 44,077 |  |  | $ | 52,294 |
Short-term investments | $ | 8,221 |  |  | $ | 2,839 |  |  | $ | 11,060 |  |  | $ | 8,217 |  |  | $ | 11,884 |  |  | $ | 20,101 |
Long-term investments | — |  |  | 31,891 |  |  | 31,891 |  |  | — |  |  | 32,193 |  |  | 32,193 |
| $ | 8,221 |  |  | $ | 34,730 |  |  | $ | 42,951 |  |  | $ | 8,217 |  |  | $ | 44,077 |  |  | $ | 52,294 |
Debt securities: The Company's short-term debt investments are principally bank certificates of deposit with contractual maturities longer than three months but shorter than one year. These debt securities are accounted for as held to maturity and recorded at amortized cost, which approximated their fair values at March 31, 2021 and December 31, 2020. Equity securities: The Company's equity investments in mutual funds and common stock are held within a trust to fund existing obligations associated with several of the Company’s non-qualified deferred compensation plans.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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