INCOME TAXES - Statutory Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal tax	$ 27,048	$ 38,621	$ 45,405
State income taxes, net of federal benefit	2,124	4,635	4,980
Share-based compensation	143	(26)	(1,835)
Research and development and jobs credits	(1,258)	(819)	(503)
Executive compensation	1,895	1,470	2,652
Charitable donations	(1,094)	(4,316)	0
Valuation allowance	(613)	396	468
Intercompany loan restructuring	1,167	0	0
Other permanent differences	106	427	808
Provision for income taxes	$ 29,382	$ 40,491	$ 52,098
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal tax, effective tax rate, percent	21.00%	21.00%	21.00%
State income taxes, net of federal benefit, effective tax rate, percent	1.70%	2.50%	2.30%
Share-based compensation - windfall, effective tax rate, percent	0.10%	0.00%	(0.80%)
Research and development and jobs credits, effective tax rate, percent	(1.00%)	(0.40%)	(0.20%)
Executive compensation, effective tax rate, percent	1.50%	0.80%	1.20%
Charitable donations, effective tax rate, percent	(0.80%)	(2.30%)	0.00%
Valuation allowance, effective tax rate, percent	(0.50%)	0.20%	0.20%
Intercompany loan restructuring, effective tax rate, percent	0.009	0	0
Other permanent differences, effective tax rate, percent	0.10%	0.20%	0.40%
Provision for income taxes, effective tax rate, percent	22.80%	22.00%	24.10%
Hong Kong
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Foreign taxes	$ 63	$ 75	$ 91
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Foreign taxes, effective tax rate, percent	0.00%	0.00%	0.00%
Singapore
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Foreign taxes	$ (199)	$ 28	$ 32
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Foreign taxes, effective tax rate, percent	(0.20%)	0.00%	0.00%

Effective Income Tax Rate Reconciliation, Charitable Donations

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Effective Income Tax Rate Reconciliation, Intercompany Loan Restructuring

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Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount, Executive Compensation

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