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FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of fair value of financial instruments using levels of inputs | The following tables summarize our assets and liabilities measured at fair value on a recurring basis using the following levels of inputs as of December 31, 2023 and 2022, as indicated (in thousands):
| Fair Value Measurements at December 31, 2023
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash equivalents—Money market mutual 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 |  |  | $ | — |  |  | $ | — |
| Fair Value Measurements at December 31, 2022
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Cash equivalents—Money market mutual funds | $ | 252,650 |  |  | $ | 252,650 |  |  | $ | — |  |  | $ | — |
Equity securities, at fair value | 82,823 |  |  | 36 |  |  | — |  |  | 82,787 |
Trading securities held in a "rabbi trust" (1) | 399 |  |  | 399 |  |  | — |  |  | — |
Total assets | $ | 335,872 |  |  | $ | 253,085 |  |  | $ | — |  |  | $ | 82,787 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation accrual "rabbi trust" (2) | $ | 396 |  |  | $ | 396 |  |  | $ | — |  |  | $ | — |
Total liabilities | $ | 396 |  |  | $ | 396 |  |  | $ | — |  |  | $ | — |
___________________________________________ (1) Included in Prepaids and other current assets and Other long-term assets, net in the consolidated balance sheets. (2) Included in Accrued liabilities and Other long-term 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 during the periods presented (in thousands):
| Amount
Level 3 investments at December 31, 2021 | $ | 102,355 |
Increase due to acquisition of Level 3 investments | 18,920 |
Decrease in fair value of Level 3 investments | (38,488) |
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 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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