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FAIR VALUE - Narrative (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 03, 2021 USD ($) | Oct. 04, 2019 USD ($) | Mar. 28, 2020 USD ($) reportingUnit | Dec. 31, 2021 USD ($) reportingUnit | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Contingent Consideration Liability Fair Value Adjustment |  |  |  | $ (2,200,000) | $ 0 | $ 0
Number of reporting units impaired | reportingUnit |  |  | 4 | 4 |  |
Impairment charge | $ 0 |  |  | $ 0 | 86,312,000 | 1,600,000
Impairment charge to right-of-use |  |  |  | 0 | 691,000 |
Long-lived asset impairment charge |  |  |  |  |  | 9,500,000
Equity investment impairment |  |  |  | 0 | 3,493,000 | 5,000,000
Severance costs |  |  |  | 600,000 | 2,600,000 | 2,800,000
Aerospace |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Impairment charge |  |  | $ 86,300,000 |  | 86,312,000 |
Intangible asset impairment charge |  |  |  |  |  | $ 6,200,000
Severance costs |  |  |  | 300,000 | 4,900,000 |
Recurring Basis | Level 3 | Other Assets |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Financial assets carried at fair value |  |  |  | 0 | 0 |
Recurring Basis | Level 3 | Other Liabilities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Financial liabilities carried at fair value |  |  |  | 0 | 0 |
Nonrecurring Basis | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Impairment charge |  |  |  | 0 |  |
Intangible asset impairment charge |  |  |  | 0 |  |
Diagnosys Test Systems Limited |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Cash purchase price |  | $ 7,000,000 |  |  |  |
Financial liabilities carried at fair value |  | 2,500,000 |  | 0 | $ 2,200,000 |
Potential additional earn-out |  | $ 13,000,000 |  |  |  |
Achievement period |  | 3 years |  |  |  |
Earn-out achievement benchmark |  | $ 72,000,000 |  |  |  |
Contingent Consideration Liability Fair Value Adjustment |  |  |  | $ 2,200,000 |  |

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