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RESTRUCTURING AND OTHER RELATED CHARGES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | $ 457 | $ 319 | $ 2,614 | $ 3,365
Operating Group Reorganization Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | 457 | 0 | 2,614 | 0
Professional fees | 200 |  | 1,700 |
Operating Group Reorganization Program | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net |  |  | 2,614 |
Operating Group Reorganization Program | Employee Severance | Corporate and shared support services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | 204 | 0 | 1,459 | 0
OneTEAM Program | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | 0 | 300 | 0 | 3,400
Severance charges incurred cumulatively to date | 11,800 |  | 11,800 |
IHT | Operating Group Reorganization Program | Employee Severance | Operating segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | 91 | 0 | 374 | 0
MS | Operating Group Reorganization Program | Employee Severance | Operating segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | 139 | 0 | 484 | 0
Quest Integrity | Operating Group Reorganization Program | Employee Severance | Operating segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other related charges, net | $ 23 | $ 0 | $ 297 | $ 0

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