SEGMENT AND GEOGRAPHIC DISCLOSURES - Segment Data for our Three Operating Segments (Details) - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues		$ 840,208,000	$ 794,197,000
Operating income (loss)		(39,802,000)	(126,882,000)
Goodwill impairment charges	[1]	0	64,632,000
Capital expenditures		19,036,000	16,898,000
Depreciation and amortization	[1]	37,595,000	41,518,000
Lease cost - continuing operations
Segment Reporting Information [Line Items]
Depreciation and amortization		36,453,000	38,902,000
IHT
Segment Reporting Information [Line Items]
Revenues		422,562,000	415,371,000
MS
Segment Reporting Information [Line Items]
Revenues		417,646,000	378,826,000
Goodwill impairment charges			55,800,000
Operating Segments | IHT
Segment Reporting Information [Line Items]
Revenues		422,562,000	415,371,000
Operating income (loss)		17,093,000	12,997,000
Capital expenditures		13,939,000	11,742,000
Operating Segments | IHT | Lease cost - continuing operations
Segment Reporting Information [Line Items]
Depreciation and amortization		12,391,000	12,959,000
Operating Segments | MS
Segment Reporting Information [Line Items]
Revenues		417,646,000	378,826,000
Operating income (loss)		20,930,000	(47,728,000)
Capital expenditures		5,013,000	3,692,000
Operating Segments | MS | Lease cost - continuing operations
Segment Reporting Information [Line Items]
Depreciation and amortization		19,021,000	20,500,000
Corporate and shared support services
Segment Reporting Information [Line Items]
Operating income (loss)		(77,825,000)	(92,151,000)
Capital expenditures		84,000	1,464,000
Corporate and shared support services | Lease cost - continuing operations
Segment Reporting Information [Line Items]
Depreciation and amortization		$ 5,041,000	$ 5,443,000

[1] Consolidated statements of cash flows include discontinued operations. December 31,20222021Cash and cash equivalents from continuing operations$58,075 $55,193 Cash and cash equivalents from discontinued operations— 10,122 Total$58,075 $65,315