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FAIR VALUE MEASUREMENT - Assets and Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
Cash equivalents—Money market funds	$ 46,374	$ 246,425
Equity securities, at fair value	21,500	41,046
Available-for-sale debt securities	10,859	10,484
Trading securities held in a "rabbi trust"		496
Total assets	78,733	298,451
Liabilities:
Deferred compensation accrual "rabbi trust"		513
Total liabilities		513
Level 1
Assets:
Cash equivalents—Money market funds	46,374	246,425
Equity securities, at fair value	0	0
Available-for-sale debt securities	0	0
Trading securities held in a "rabbi trust"		496
Total assets	46,374	246,921
Liabilities:
Deferred compensation accrual "rabbi trust"		513
Total liabilities		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
Total assets	0	0
Liabilities:
Deferred compensation accrual "rabbi trust"		0
Total liabilities		0
Level 3
Assets:
Cash equivalents—Money market funds	0	0
Equity securities, at fair value	21,500	41,046
Available-for-sale debt securities	10,859	10,484
Trading securities held in a "rabbi trust"		0
Total assets	$ 32,359	51,530
Liabilities:
Deferred compensation accrual "rabbi trust"		0
Total liabilities		$ 0

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