SEGMENT AND GEOGRAPHIC DISCLOSURES - Segment Data for our Three Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total Revenues	$ 202,277	$ 189,036
Total Operating income (loss)	(7,746)	(22,407)
Total Capital expenditures	2,028	5,622
Total Depreciation and amortization	9,546	9,454
IHT
Segment Reporting Information [Line Items]
Total Revenues	101,829	95,595
MS
Segment Reporting Information [Line Items]
Total Revenues	100,448	93,441
Operating segments | IHT
Segment Reporting Information [Line Items]
Total Revenues	101,829	95,595
Total Operating income (loss)	4,723	134
Total Capital expenditures	1,427	4,771
Total Depreciation and amortization	3,054	3,254
Operating segments | MS
Segment Reporting Information [Line Items]
Total Revenues	100,448	93,441
Total Operating income (loss)	3,193	513
Total Capital expenditures	601	813
Total Depreciation and amortization	4,753	4,884
Corporate and shared support services
Segment Reporting Information [Line Items]
Total Operating income (loss)	(15,662)	(23,054)
Total Capital expenditures	0	38
Total Depreciation and amortization	$ 1,739	$ 1,316