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Investments in debt and equity securities | 9 Months Ended
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Sep. 30, 2023
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:
| September 30, 2023 |  | December 31, 2022
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 20,430 |  |  | $ | — |  |  | $ | 20,430 |  |  | $ | 82,879 |  |  | $ | — |  |  | $ | 82,879 |
Investments in mutual funds and common stocks | — |  |  | 36,603 |  |  | 36,603 |  |  | — |  |  | 39,143 |  |  | 39,143 |
| $ | 20,430 |  |  | $ | 36,603 |  |  | $ | 57,033 |  |  | $ | 82,879 |  |  | $ | 39,143 |  |  | $ | 122,022 |
Short-term investments | $ | 5,419 |  |  | $ | 6,294 |  |  | $ | 11,713 |  |  | $ | 67,872 |  |  | $ | 9,821 |  |  | $ | 77,693 |
Long-term investments | 15,011 |  |  | 30,309 |  |  | 45,320 |  |  | 15,007 |  |  | 29,322 |  |  | 44,329 |
| $ | 20,430 |  |  | $ | 36,603 |  |  | $ | 57,033 |  |  | $ | 82,879 |  |  | $ | 39,143 |  |  | $ | 122,022 |
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 September 30, 2023 and December 31, 2022. Equity securitie s. The Company holds certain equity investments that have readily determinable fair values from public markets. The Company's remaining 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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