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FAIR VALUE MEASUREMENT - Assets and Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Cash equivalents—Money market funds | $ 199,279 | $ 246,425
Equity securities, at fair value | 32,328 | 41,046
Available-for-sale debt securities | 10,608 | 10,484
Trading securities held in a "rabbi trust" | 519 | 496
Total assets | 242,734 | 298,451
Liabilities: |  |
Deferred compensation accrual "rabbi trust" | 537 | 513
Total liabilities | 537 | 513
Level 1 |  |
Assets: |  |
Cash equivalents—Money market funds | 199,279 | 246,425
Equity securities, at fair value | 0 | 0
Available-for-sale debt securities | 0 | 0
Trading securities held in a "rabbi trust" | 519 | 496
Total assets | 199,798 | 246,921
Liabilities: |  |
Deferred compensation accrual "rabbi trust" | 537 | 513
Total liabilities | 537 | 513
Level 2 |  |
Assets: |  |
Cash equivalents—Money market funds | 0 | 0
Equity securities, at fair value | 0 | 0
Available-for-sale debt securities | 0 | 0
Trading securities held in a "rabbi trust" | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Deferred compensation accrual "rabbi trust" | 0 | 0
Total liabilities | 0 | 0
Level 3 |  |
Assets: |  |
Cash equivalents—Money market funds | 0 | 0
Equity securities, at fair value | 32,328 | 41,046
Available-for-sale debt securities | 10,608 | 10,484
Trading securities held in a "rabbi trust" | 0 | 0
Total assets | 42,936 | 51,530
Liabilities: |  |
Deferred compensation accrual "rabbi trust" | 0 | 0
Total liabilities | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 + Details
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