SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segment Reporting - CODM (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Net revenues	$ 522,186	$ 501,478	$ 477,870
Operating expenses
Depreciation and amortization	51,359	47,294	43,433
Other operating items, net	28,668	5,910	7,115
Interest expense, net	(104)	(1,625)	(2,420)
Provision for income taxes	(19,630)	(26,079)	(21,543)
Net income	72,769	82,448	87,479
Single reportable segment
Revenues
Net revenues	522,186	501,478	477,870
Operating expenses
Labor expense	158,904	153,705	143,053
Cost of sales	44,866	42,041	40,629
Tax and license expense	76,518	73,288	67,553
Other operating expense	69,368	69,088	64,645
Depreciation and amortization	51,359	47,294	43,433
Other operating items, net	28,668	5,910	7,115
Interest expense, net	104	1,625	2,420
Provision for income taxes	19,630	26,079	21,543
Total operating expenses	449,417	419,030	390,391
Net income	$ 72,769	$ 82,448	$ 87,479