SEGMENT REPORTING - Financial Information by Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
SEGMENT REPORTING [Abstract]
REVENUE	$ 159,177	$ 141,389	$ 445,695	$ 375,369
COSTS AND EXPENSES:
Instructional	28,368	24,813	84,144	71,372
Books and tools	16,423	14,915	36,634	29,393
Facilities	14,506	12,239	41,388	37,257
Depreciation and amortization	7,825	5,316	22,982	13,461
Educational services and facilities	67,122	57,283	185,148	151,483
Sales and marketing	28,991	25,347	77,633	63,920
Student services	7,751	6,332	23,010	18,933
Provision for credit losses	17,344	17,572	47,062	42,584
Administrative	30,124	28,416	95,040	85,866
Depreciation and amortization	130	144	396	472
Selling, general and administrative	84,340	77,811	243,141	211,775
(Gain) loss on sale of assets	19	10	(8)	(466)
Total costs and expenses	151,481	135,104	428,281	362,792
OPERATING INCOME	7,696	6,285	17,414	12,577
Reportable Segments [Member] | Campus Operations [Member]
SEGMENT REPORTING [Abstract]
REVENUE	159,177	141,389	445,695	375,369
COSTS AND EXPENSES:
Instructional	28,368	24,813	84,144	71,372
Books and tools	16,423	14,915	36,634	29,393
Facilities	14,506	12,239	41,388	37,257
Depreciation and amortization	7,825	5,316	22,982	13,461
Educational services and facilities	67,122	57,283	185,148	151,483
Sales and marketing	28,991	25,347	77,633	63,920
Student services	7,751	6,332	23,010	18,933
Provision for credit losses	17,344	17,566	47,062	42,542
Administrative	13,107	11,590	38,687	34,750
Depreciation and amortization	0	0	0	0
Selling, general and administrative	67,193	60,835	186,392	160,145
(Gain) loss on sale of assets	19	10	15	(500)
Total costs and expenses	134,334	118,128	371,555	311,128
OPERATING INCOME	24,843	23,261	74,140	64,241
Corporate [Member]
SEGMENT REPORTING [Abstract]
REVENUE	0	0	0	0
COSTS AND EXPENSES:
Instructional	0	0	0	0
Books and tools	0	0	0	0
Facilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Educational services and facilities	0	0	0	0
Sales and marketing	0	0	0	0
Student services	0	0	0	0
Provision for credit losses	0	6	0	42
Administrative	17,017	16,826	56,353	51,116
Depreciation and amortization	130	144	396	472
Selling, general and administrative	17,147	16,976	56,749	51,630
(Gain) loss on sale of assets	0	0	(23)	34
Total costs and expenses	17,147	16,976	56,726	51,664
OPERATING INCOME	$ (17,147)	$ (16,976)	$ (56,726)	$ (51,664)