FIXED ASSETS AND INTERNALLY DEVELOPED SOFTWARE, NET - Schedule of Fixed Assets and Internally Developed Software, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fixed assets
Property, Plant, and Equipment [Line Items]
Less: Accumulated depreciation and amortization	$ (138,773)	$ (129,674)
Total, net	64,149	46,854
Land
Property, Plant, and Equipment [Line Items]
Total, gross	2,209	2,209
Building and improvements
Property, Plant, and Equipment [Line Items]
Total, gross	9,373	9,373
Furniture and equipment
Property, Plant, and Equipment [Line Items]
Total, gross	151,975	126,086
Leasehold improvements
Property, Plant, and Equipment [Line Items]
Total, gross	31,843	31,368
Purchased software
Property, Plant, and Equipment [Line Items]
Total, gross	7,522	7,492
Internally developed software
Property, Plant, and Equipment [Line Items]
Total, gross	118,162	112,843
Less: Accumulated depreciation and amortization	(81,761)	(76,510)
Total, net	$ 36,401	$ 36,333