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DIVESTITURE ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2022 | Oct. 06, 2021 | Feb. 13, 2021 | Jul. 12, 2019 | Feb. 13, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Net Gain on Sale of Facility |  |  |  |  |  | $ 5,014 | $ 0 | $ 5,014 | $ 0 | $ 0
Facilities in Aerospace Segment |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of facilities |  |  |  |  |  |  |  |  | $ 1,500 |
Held for Sale | First Earnout |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum total earnout proceeds |  |  |  |  | $ 35,000 |  |  |  |  |
Held for Sale | Second Earnout |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum total earnout proceeds |  |  |  |  | 0 |  |  |  |  |
Held for Sale | Test Systems |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Total cash proceeds of divesture |  |  |  |  | 103,800 |  |  |  |  |
Gain on sale, net of tax |  |  |  |  | 80,100 |  |  |  |  |
Income taxes from divesture |  |  |  |  | $ 19,700 |  |  |  |  |
Contingent earn-outs |  |  | $ 10,700 |  |  |  |  |  |  |
Held for Sale | Test Systems | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent earn-outs | $ 11,200 |  |  |  |  |  |  |  |  |
Disposed of by Sale | Airfield Lighting Product Line |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 1,000 |  |  |  |  |  |
Percentage of revenue (as a percentage) |  |  |  | 1.00% |  |  |  |  |  |
Pre-tax loss on sale |  |  |  | $ (1,300) |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Facilities in Aerospace Segment |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Held for sale |  | $ 9,200 |  |  |  |  |  |  |  |
Proceeds from sale of facilities |  | $ 8,800 |  |  |  |  |  |  |  |
Net Gain on Sale of Facility |  |  |  |  |  |  |  | $ 5,000 |  |

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