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)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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+ Details