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Investments in debt and equity securities | 6 Months Ended
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Jun. 30, 2022
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:
| June 30, 2022 |  | December 31, 2021
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 104,837 |  |  | $ | — |  |  | $ | 104,837 |  |  | $ | 23,226 |  |  | $ | — |  |  | $ | 23,226 |
Investments in mutual funds and common stocks | — |  |  | 40,214 |  |  | 40,214 |  |  | — |  |  | 48,598 |  |  | 48,598 |
| $ | 104,837 |  |  | $ | 40,214 |  |  | $ | 145,051 |  |  | $ | 23,226 |  |  | $ | 48,598 |  |  | $ | 71,824 |
Short-term investments | $ | 89,830 |  |  | $ | 10,659 |  |  | $ | 100,489 |  |  | $ | 8,227 |  |  | $ | 14,083 |  |  | $ | 22,310 |
Long-term investments | 15,007 |  |  | 29,555 |  |  | 44,562 |  |  | 14,999 |  |  | 34,515 |  |  | 49,514 |
| $ | 104,837 |  |  | $ | 40,214 |  |  | $ | 145,051 |  |  | $ | 23,226 |  |  | $ | 48,598 |  |  | $ | 71,824 |
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 June 30, 2022 and December 31, 2021. 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://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 https://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 https://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 https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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