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Investments in debt and equity securities | 3 Months Ended
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Mar. 31, 2024
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 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, 2024 |  | December 31, 2023
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 22,014 |  |  | $ | — |  |  | $ | 22,014 |  |  | $ | 22,109 |  |  | $ | — |  |  | $ | 22,109 |
Investments in mutual funds and common stocks | — |  |  | 36,326 |  |  | 36,326 |  |  | — |  |  | 37,391 |  |  | 37,391 |
| $ | 22,014 |  |  | $ | 36,326 |  |  | $ | 58,340 |  |  | $ | 22,109 |  |  | $ | 37,391 |  |  | $ | 59,500 |
Short-term investments | $ | 7,011 |  |  | $ | 3,600 |  |  | $ | 10,611 |  |  | $ | 7,110 |  |  | $ | 4,500 |  |  | $ | 11,610 |
Long-term investments | 15,003 |  |  | 32,726 |  |  | 47,729 |  |  | 14,999 |  |  | 32,891 |  |  | 47,890 |
| $ | 22,014 |  |  | $ | 36,326 |  |  | $ | 58,340 |  |  | $ | 22,109 |  |  | $ | 37,391 |  |  | $ | 59,500 |
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. The Company's long-term debt investments are bank time deposits with contractual maturities longer 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, 2024 and December 31, 2023. Equity securitie s. Substantially all of the Company's short-term and long-term equity investments are held within a trust to fund existing obligations associated with 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) -Publisher SEC Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//946-320/tableOfContent Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//940-320/tableOfContent Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//942-320/tableOfContent + Details
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