GOODWILL AND IMPAIRMENT CHARGES (Details)	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	$ 356,904,000
Accumulated Impairment, beginning balance	(331,661,000)
Goodwill, Net, beginning balance	25,243,000
FX Adjustments	6,000
Goodwill, Gross, ending balance	356,910,000
Accumulated Impairment, ending balance	(331,661,000)
Goodwill, Net, ending balance	25,249,000
IHT
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	212,928,000
Accumulated Impairment, beginning balance	(212,928,000)
Goodwill, Net, beginning balance	0
Goodwill, Gross, ending balance	212,928,000
Accumulated Impairment, ending balance	(212,928,000)
Goodwill, Net, ending balance	0
MS
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	109,938,000
Accumulated Impairment, beginning balance	(109,938,000)
Goodwill, Net, beginning balance	0
Goodwill, Gross, ending balance	109,938,000
Accumulated Impairment, ending balance	(109,938,000)
Goodwill, Net, ending balance	0
Quest Integrity
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	34,038,000
Accumulated Impairment, beginning balance	(8,795,000)
Goodwill, Net, beginning balance	25,243,000
FX Adjustments	6,000
Goodwill, Gross, ending balance	34,044,000
Accumulated Impairment, ending balance	(8,795,000)
Goodwill, Net, ending balance	$ 25,249,000