SEGMENT DISCLOSURES - Segment Data For Our Two Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 210,758	$ 206,715	$ 638,976	$ 648,484
Total operating income (loss)	3,158	(1,258)	7,931	(4,408)
Total capital expenditures	1,218	1,833	5,709	6,130
Total depreciation and amortization	9,034	9,396	27,934	28,481
Total depreciation and amortization	9,034	9,396	27,934	28,481
Amount included in operating expenses
Segment Reporting Information [Line Items]
Total depreciation and amortization	3,429	3,613	10,520	11,026
Amount included in SG&A expenses
Segment Reporting Information [Line Items]
Total depreciation and amortization	5,605	5,783	17,414	17,455
IHT
Segment Reporting Information [Line Items]
Total revenues	107,604	103,857	320,286	322,426
MS
Segment Reporting Information [Line Items]
Total revenues	103,154	102,858	318,690	326,058
Operating segments | IHT
Segment Reporting Information [Line Items]
Total revenues	107,604	103,857	320,286	322,426
Total operating income (loss)	9,860	6,412	27,504	17,683
Total capital expenditures	234	835	3,029	3,857
Total depreciation and amortization	2,928	3,148	8,935	9,390
Operating segments | MS
Segment Reporting Information [Line Items]
Total revenues	103,154	102,858	318,690	326,058
Total operating income (loss)	4,460	6,482	19,188	22,395
Total capital expenditures	932	988	2,577	2,263
Total depreciation and amortization	4,504	4,656	13,718	14,113
Corporate and shared support services
Segment Reporting Information [Line Items]
Total operating income (loss)	(11,162)	(14,152)	(38,761)	(44,486)
Total capital expenditures	52	10	103	10
Total depreciation and amortization	$ 1,602	$ 1,592	$ 5,281	$ 4,978