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FAIR VALUE MEASUREMENT (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | The following tables summarize our assets and liabilities measured at fair value on a recurring basis using the following levels of inputs (in thousands):
| Fair Value Measurements at March 31, 2024
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash equivalents—Money market funds | $ | 199,279 |  |  | $ | 199,279 |  |  | $ | — |  |  | $ | — |
Equity securities, at fair value | 32,328 |  |  | — |  |  | — |  |  | 32,328 |
Available-for-sale debt securities (1) | 10,608 |  |  | — |  |  | — |  |  | 10,608 |
Trading securities held in a "rabbi trust" (1) | 519 |  |  | 519 |  |  | — |  |  | — |
Total assets | $ | 242,734 |  |  | $ | 199,798 |  |  | $ | — |  |  | $ | 42,936 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation accrual "rabbi trust" (2) | $ | 537 |  |  | $ | 537 |  |  | $ | — |  |  | $ | — |
Total liabilities | $ | 537 |  |  | $ | 537 |  |  | $ | — |  |  | $ | — |
| Fair Value Measurements at December 31, 2023
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash equivalents—Money market funds | $ | 246,425 |  |  | $ | 246,425 |  |  | $ | — |  |  | $ | — |
Equity securities, at fair value | 41,046 |  |  | — |  |  | — |  |  | 41,046 |
Available-for-sale debt securities (1) | 10,484 |  |  | — |  |  | — |  |  | 10,484 |
Trading securities held in a "rabbi trust" (1) | 496 |  |  | 496 |  |  | — |  |  | — |
Total assets | $ | 298,451 |  |  | $ | 246,921 |  |  | $ | — |  |  | $ | 51,530 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation accrual "rabbi trust" (2) | $ | 513 |  |  | $ | 513 |  |  | $ | — |  |  | $ | — |
Total liabilities | $ | 513 |  |  | $ | 513 |  |  | $ | — |  |  | $ | — |
___________________________________________ (1) Included in Prepaids and other current assets and Other long-term assets, net in the consolidated balance sheets. (2) Included in Accrued liabilities in the consolidated balance sheets.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table provides activity for our Level 3 investments (in thousands):
| Amount
Level 3 investments at December 31, 2022 | $ | 82,787 |
Increase due to purchases of Level 3 investments | 10,000 |
Decrease in fair value of Level 3 investments | (41,741) |
Accrued interest on Level 3 investments | 484 |
Level 3 investments at December 31, 2023 | 51,530 |
Decrease in fair value of Level 3 investments | (8,718) |
Accrued interest on Level 3 investments | 124 |
Level 3 investments at March 31, 2024 | $ | 42,936 |

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- Definition Tabular disclosure of financial instrument measured at fair value on recurring or nonrecurring basis. Includes, but is not limited to, instrument classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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