REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
REVENUE RECOGNITION [Abstract]
Unearned tuition	$ 24,154	$ 25,405
Revenue recognized included in contract liability	24,600
Disaggregation of Revenue [Abstract]
Revenue	348,287	335,336
Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	21,722	23,079
Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	326,565	312,257
Transportation and Skilled Trades Segment [Member]
Disaggregation of Revenue [Abstract]
Revenue	249,905	240,531
Transportation and Skilled Trades Segment [Member] | Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	15,523	17,393
Transportation and Skilled Trades Segment [Member] | Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	234,382	223,138
Healthcare and Other Professions Segment [Member]
Disaggregation of Revenue [Abstract]
Revenue	91,535	87,998
Healthcare and Other Professions Segment [Member] | Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	5,911	5,402
Healthcare and Other Professions Segment [Member] | Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	85,624	82,596
Transitional Segment [Member]
Disaggregation of Revenue [Abstract]
Revenue	6,847	6,807
Transitional Segment [Member] | Services Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	288	284
Transitional Segment [Member] | Services Transferred over Time [Member]
Disaggregation of Revenue [Abstract]
Revenue	$ 6,559	$ 6,523