FAIR VALUE MEASUREMENT - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Acquired Portfolio \| Purchasing Power
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Purchasing Power accounts receivable - acquired portfolio	$ 39,633	$ 0
Level 1
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Deferred compensation liability	0	0
Level 1 \| Acquired Portfolio \| Purchasing Power
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Purchasing Power accounts receivable - acquired portfolio	0	0
Purchasing Power other receivables - acquired portfolio	0	0
Level 2
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Deferred compensation liability	4,011	3,431
Level 2 \| Acquired Portfolio \| Purchasing Power
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Purchasing Power accounts receivable - acquired portfolio	0	0
Purchasing Power other receivables - acquired portfolio	0	0
Level 3
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Deferred compensation liability	0	0
Level 3 \| Acquired Portfolio \| Purchasing Power
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Purchasing Power accounts receivable - acquired portfolio	39,633	0
Purchasing Power other receivables - acquired portfolio	$ 3,494	$ 0