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Discontinued Operations - Net Sales and Losses from Discontinued Operations (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 04, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income (loss) from discontinued operations |  | $ 72 | $ (23,979)
Income tax benefit |  | 0 | 5,738
Income (loss) from discontinued operations (Note 3) |  | 72 | (18,241)
Test and Inspection Services |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income (loss) from discontinued operations (Note 3) | $ (10,034) |  |
Test and Inspection Services | Discontinued Operations, Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net sales |  | 0 | 13,590
Income (loss) from discontinued operations |  | 72 | (10,807)
Income tax benefit |  | 0 | 2,600
Loss on the sale of discontinued operations |  | 0 | (13,172)
Income tax benefit on the sale of discontinued operations |  | 0 | 3,138
Income (loss) from discontinued operations (Note 3) |  | $ 72 | $ (18,241)

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