GOODWILL (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	$ 356,904
Accumulated Impairment, beginning balance	(331,661)
Goodwill, Net, beginning balance	25,243
FX Adjustments	(696)
Goodwill, Gross, ending balance	356,208
Accumulated Impairment, ending balance	(331,661)
Goodwill, Net, ending balance	24,547
IHT
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	212,928
Accumulated Impairment, beginning balance	(212,928)
Goodwill, Net, beginning balance	0
Goodwill, Gross, ending balance	212,928
Accumulated Impairment, ending balance	(212,928)
Goodwill, Net, ending balance	0
MS
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	109,938
Accumulated Impairment, beginning balance	(109,938)
Goodwill, Net, beginning balance	0
Goodwill, Gross, ending balance	109,938
Accumulated Impairment, ending balance	(109,938)
Goodwill, Net, ending balance	0
Quest Integrity
Goodwill [Roll Forward]
Goodwill, Gross, beginning balance	34,038
Accumulated Impairment, beginning balance	(8,795)
Goodwill, Net, beginning balance	25,243
FX Adjustments	(696)
Goodwill, Gross, ending balance	33,342
Accumulated Impairment, ending balance	(8,795)
Goodwill, Net, ending balance	$ 24,547