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GOODWILL AND IMPAIRMENT CHARGES - Goodwill Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Gross, beginning balance |  |  |  | $ 358,380 |
Accumulated Impairment, beginning balance |  |  |  | (267,029) |
Goodwill, Net, beginning balance |  |  |  | 91,351 |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | (1,333) |
Goodwill, Gross, Impairment charge |  |  |  | 0 |
Accumulated Impairment, Impairment charge |  |  |  | 55,837 |
Goodwill, Net, Impairment charge | $ (55,837) | $ 0 |  | (55,837) | $ (191,788)
Goodwill, Gross, ending balance | 357,047 |  |  | 357,047 |
Accumulated Impairment, ending balance | (322,866) |  |  | (322,866) |
Goodwill, Net, ending balance | 34,181 |  |  | 34,181 |
IHT |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Gross, beginning balance |  |  |  | 212,928 |
Accumulated Impairment, beginning balance |  |  |  | (212,928) |
Goodwill, Net, beginning balance |  |  |  | 0 |
Goodwill, Net, Impairment charge |  |  | $ (191,800) |  |
Goodwill, Gross, ending balance | 212,928 |  |  | 212,928 |
Accumulated Impairment, ending balance | (212,928) |  |  | (212,928) |
Goodwill, Net, ending balance | 0 |  |  | 0 |
MS |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Gross, beginning balance |  |  |  | 110,721 |
Accumulated Impairment, beginning balance |  |  |  | (54,101) |
Goodwill, Net, beginning balance |  |  |  | 56,620 |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | (783) |
Goodwill, Gross, Impairment charge |  |  |  | 0 |
Accumulated Impairment, Impairment charge |  |  |  | 55,837 |
Goodwill, Net, Impairment charge |  |  |  | (55,837) |
Goodwill, Gross, ending balance | 109,938 |  |  | 109,938 |
Accumulated Impairment, ending balance | (109,938) |  |  | (109,938) |
Goodwill, Net, ending balance | 0 |  |  | 0 |
Quest Integrity |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Gross, beginning balance |  |  |  | 34,731 |
Accumulated Impairment, beginning balance |  |  |  | 0 |
Goodwill, Net, beginning balance |  |  |  | 34,731 |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  |  | (550) |
Goodwill, Gross, ending balance | 34,181 |  |  | 34,181 |
Accumulated Impairment, ending balance | 0 |  |  | 0 |
Goodwill, Net, ending balance | $ 34,181 |  |  | $ 34,181 |

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