SEGMENT DISCLOSURES - Segment Data for our Three Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 228,618	$ 239,492	$ 428,218	$ 441,769
Total operating income (loss)	11,159	4,596	4,773	(3,150)
Total capital expenditures	2,930	2,269	4,491	4,297
Total depreciation and amortization	9,260	9,539	18,900	19,085
IHT
Segment Reporting Information [Line Items]
Total revenues	113,234	116,740	212,682	218,569
MS
Segment Reporting Information [Line Items]
Total revenues	115,384	122,752	215,536	223,200
Operating segments | IHT
Segment Reporting Information [Line Items]
Total revenues	113,234	116,740	212,682	218,569
Total operating income (loss)	12,459	6,548	17,644	11,271
Total capital expenditures	2,259	1,595	2,795	3,022
Total depreciation and amortization	2,978	3,188	6,007	6,242
Operating segments | MS
Segment Reporting Information [Line Items]
Total revenues	115,384	122,752	215,536	223,200
Total operating income (loss)	10,637	12,720	14,728	15,913
Total capital expenditures	620	674	1,645	1,275
Total depreciation and amortization	4,565	4,704	9,214	9,457
Corporate and shared support services
Segment Reporting Information [Line Items]
Total operating income (loss)	(11,937)	(14,672)	(27,599)	(30,334)
Total capital expenditures	51	0	51	0
Total depreciation and amortization	$ 1,717	$ 1,647	$ 3,679	$ 3,386