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FAIR VALUE MEASUREMENT - Assets and Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Cash equivalents—Money market funds	$ 146,760	$ 246,425
Equity securities, at fair value	32,328	41,046
Available-for-sale debt securities	10,733	10,484
Trading securities held in a "rabbi trust"	1	496
Total assets	189,822	298,451
Liabilities:
Deferred compensation accrual "rabbi trust"	535	513
Total liabilities	535	513
Level 1
Assets:
Cash equivalents—Money market funds	146,760	246,425
Equity securities, at fair value	0	0
Available-for-sale debt securities	0	0
Trading securities held in a "rabbi trust"	1	496
Total assets	146,761	246,921
Liabilities:
Deferred compensation accrual "rabbi trust"	535	513
Total liabilities	535	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	10,733	10,484
Trading securities held in a "rabbi trust"	0	0
Total assets	43,061	51,530
Liabilities:
Deferred compensation accrual "rabbi trust"	0	0
Total liabilities	$ 0	$ 0

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